The Colbert Report Season 2, Episode 155: Dr. Peter Singer

Nancy Grace

Carl Bernstein

John Stossel

TONIGHT: Stephen Colbert welcomes ABC News' John Stossel!

Ken Miller

TONIGHT: Stephen Colbert welcomes Professor of Biology at Brown University, Ken Miller!

George Stephanopoulos

TONIGHT: Stephen Colbert welcomes the host of "This Week", George Stephanopoulos!

Andrew Sullivan

TONIGHT: Stephen Colbert welcomes author and blogger, Andrew Sullivan!

Frank McCourt

TONIGHT: Stephen Colbert welcomes the author of "Teacher Man: A Memoir", Frank McCourt!

Nina Totenberg

TONIGHT: Stephen Colbert welcomes National Public Radio's legal affairs correspondent, Nina Totenberg!

David Gregory

Robin Givhan

TONIGHT: Stephen Colbert welcomes "Washington Post" fashion editor, Robin Givhan!

Norah Vincent

TONIGHT: Stephen Colbert welcomes the author of "Self-Made Man: One Woman's Journey into Manhood and Back" Norah Vincent!

Paul Begala

TONIGHT: Stephen Colbert welcomes CNN commentator and the co-author of "Take It Back: Our Party, Our Country, Our Future", Paul Begala!

Annie Duke

TONIGHT: Stephen Colbert welcomes Rev. Jesse Jackson!

Dave Marash

TONIGHT: Stephen Colbert welcomes the author of "Manliness", Harvey Mansfield!

Emily Yoffe

TONIGHT: Stephen Colbert welcomes the author of "What the Dog Did: Tales from a Formerly Reluctant Dog Owner", Emily Yoffe!

Christine Todd Whitman

TONIGHT: Stephen Colbert welcomes the author of "It's My Party, Too: The Battle for the Heart of the GOP and the Future of America", Christine Todd Whitman!

Sen. Barbara Boxer

TONIGHT: Stephen Colbert welcomes California Senator Barbara Boxer!

James Woolsey

TONIGHT: Stephen Colbert welcomes former CIA Director James Woolsey!

Alan Dershowitz

TONIGHT: Stephen Colbert welcomes the author of "The Case for Peace: How the Arab-Israeli Conflict Can be Resolved", Alan Dershowitz!

George Packer

TONIGHT: Stephen Colbert welcomes the author of "The Assassins' Gate: America in Iraq", George Packer!

Lama Surya Das

TONIGHT: Stephen Colbert welcomes the author of Natural Radiance: Awakening to Your Great Perfection, Lama Surya Das!

Michael Eric Dyson

TONIGHT: Stephen Colbert welcomes the author of Come Hell or High Water: Hurricane Katrina And the Color of Disaster, Michael Eric Dyson!

David Brooks

TONIGHT: Stephen Colbert welcomes the editor of The Weekly Standard, Bill Kristol!

Tony Campolo

TONIGHT: Stephen Colbert welcomes the author of Adventures in Missing the Point: How the Culture-Controlled Church Neutered the Gospel, Tony Campolo!

Brett O'Donnell

TONIGHT: Stephen Colbert welcomes the director of debate at King's College, Brett O'Donnell!

Arianna Huffington

TONIGHT: Stephen Colbert welcomes author and internet blogger, Arianna Huffington!

Jeffrey Sachs

TONIGHT: Stephen Colbert welcomes the author of The End of Poverty: Economic Possibilities for Our Time, Jeffrey Sachs!

Bob Schieffer

TONIGHT: Stephen Colbert welcomes the author of The Shere Hite Reader, Shere Hite!

Norman Ornstein

TONIGHT: Stephen Colbert welcomes the author of The Broken Branch: How Congress Is Failing America and How to Get It Back on Track, Norman Ornstein!

James Webb

TONIGHT: Stephen Colbert welcomes the author of Born Fighting: How the Scots-Irish Shaped America, James Webb!

Lorraine Bracco

TONIGHT: Stephen Colbert welcomes actress, Lorraine Bracco!

Christopher Buckley

TONIGHT: Stephen Colbert welcomes the author of Thank You for Smoking : A Novel, Christopher Buckley!

Keith Olbermann

TONIGHT: Stephen Colbert welcomes the host of Countdown with Keith Olbermann, Keith Olbermann!

Al Franken

TONIGHT: Stephen Colbert welcomes the host of The Al Franken Show, Al Franken!

Frank Vincent

TONIGHT: Stephen Colbert welcomes the author of A Guy's Guide to Being a Man's Man, Frank Vincent!

Connie Chung

Tonight Stephen welcomes Dateline NBC anchor Stone Philips.

Steve Kroft

TONIGHT: Stephen Colbert welcomes 60 Minutes correspondent, Steve Kroft!

Dan Senor

TONIGHT: Stephen Colbert welcomes Advisor to the U.S. Presidential Envoy in Iraq, Dan Senor!

John Kasich

Tonight Stephen welcomes Steven Johnson, author of Everything Bad Is Good For You.

Sen. Gary Hart

Tonight Stephen welcomes environmental politician, Robert F. Kennedy Jr.

Michael Brown

Tonight Stephen welcomes mammologist and paleontologist Tim Flannery, author of The Weather Makers.

Bruce Bartlett

TONIGHT: Stephen Colbert welcomes the author of Impostor: How George W. Bush Bankrupted America and Betrayed the Reagan Legacy, Bruce Bartlett!

Robert Greenwald

TONIGHT: Stephen Colbert welcomes the producer of Wal-Mart: The High Cost of Low Price, Outfoxed: Rupert Murdoch's War on Journalism, and most recently, The Big Buy: How Tom Delay Stole Congress, Robert Greenwald!

Michael Smerconish

Tonight Stephen welcomes ocweekly.com's Ask a Mexican columnist Gustavo Arellano.

Rev. Jesse Jackson

Tonight Stephen welcomes Bart Ehrman, author of Misquoting Jesus.

Harvey Mansfield

Tonight Stephen welcomes Angela "Bay" Buchanan, President of The American Cause.

Markos Moulitsas

Tonight Stephen welcomes the author of The Great Deluge, Douglas Brinkley.

Reza Aslan

TONIGHT: Stephen Colbert welcomes the author of No god But God, Reza Aslan!

Anthony Romero

Tonight Stephen welcomes the host of Hardball, Chris Matthews.

Caitlin Flanagan

TONIGHT: Stephen Colbert welcomes the author of To Hell With All That: Loving and Loathing Our Inner Housewife, Caitlin Flanagan!

Ralph Nader

Tonight Stephen welcomes journalist Christpher Noxon, author of Rejuvenile.

Hugh Hewitt

TONIGHT: Stephen Colbert welcomes the author of Painting the Map Red: The Fight to Create a Permanent Republican Majority, Hugh Hewitt!

Sam Harris

Tonight Stephen welcomes skateboarding legend Tony Hawk.

Sebastian Junger

Tonight Stephen welcomes editor in chief for U.S. News World Report, Mort Zuckerman.

Bill Kristol

TONIGHT: Stephen Colbert welcomes the editor of The Weekly Standard, Bill Kristol!

Jon Meacham

TONIGHT: Stephen Colbert welcomes the author of American Gospel: God, the Founding Fathers, and the Making of a Nation, Jon Meacham!

Gov. Mike Huckabee

TONIGHT: Stephen Colbert welcomes the author of Quit Digging Your Grave with a Knife and Fork: A 12-Stop Program to End Bad Habits and Begin a Healthy Lifestyle and the Governor of Arkansas, Gov. Mike Huckabee!

Paul Rieckhoff

TONIGHT: Stephen Colbert welcomes the author of Chasing Ghosts: A Soldier's Fight for America from Baghdad to Washington, Paul Rieckhoff!

Rick Reilly

TONIGHT: Stephen Colbert welcomes the author of Shanks For Nothing, Rick Reilly!

Shere Hite

TONIGHT: Stephen Colbert welcomes the author of The Shere Hite Reader, Shere Hite!

Frank Rich

TONIGHT: Stephen Colbert welcomes editor of the New York Times, Frank Rich!

Bill Bastone

TONIGHT: Stephen Colbert welcomes editor of The Smoking Gun.com, Bill Bastone!

Madeleine Albright

TONIGHT: Stephen Colbert welcomes the former Secretary of State, Madeleine Albright!

Ned Lamont

Tonght, Democratic hopeful for Senate in Connecticut, Ned Lamont.

Tyson Slocum

Tonight former editor for the New Republic and author of The Good Fight: Why Liberals--And Only Liberals--Can Win the War On Terror and Make America Great Again, Peter Beinart.

Jonathan Alter

Tonight former attorney and professor of philisophy Linda R. Hirshman, author of Get to Work: A Manifesto for Women in the World.

Ted Daeschler

TONIGHT: Stephen Colbert welcomes the Assistant Curator and Chair, Vertebrate Zoology at the Center for Systematic Biology & Evolution, Ted Daeschler!

Stone Phillips

Tonight Stephen welcomes Dateline NBC anchor Stone Philips.

Christiane Amanpour

Tonight Stephen welcomes CNN's chief international correspondent Christiane Amanpour.

Steven Squyres

Tonight Stephen welcomes Cornell University scientist and author of Roving Mars Steven Squyres.

Steven Johnson

Robert F. Kennedy Jr.

Tim Flannery

Tonight Stephen welcomes mammologist and paleontologist Tim Flannery, author of The Weather Makers.

David Sirota

Tonight Stephen welcomes legendary musician Neil Young.

Michael Pollan

Tonight Stephen welcomes Geoffrey Nunberg, professor of linguistics and columnist for the New York Times and author of Talking Right: How Conservatives Turned Liberalsim into a Tax Raising, Latte-Drinking, Sushi-Eating, Volvo-Driving, New York Times-Reading, Body Piercing, Hollywood Loving, Left-Wing Freak Show.

Gustavo Arellano

Tonight Stephen welcomes ocweekly.com's Ask a Mexican columnist Gustavo Arellano.

Bart Ehrman

Tonight Stephen welcomes Bart Ehrman, author of Misquoting Jesus.

Bay Buchanan

Tonight Stephen welcomes Angela "Bay" Buchanan, President of The American Cause.

Douglas Brinkley

Tonight Stephen welcomes comedian Martin Short.

Marc Bowden

Tonight Stephen welcomes Marc Bowden, author of Guests of the Ayatollah: The First Battle in America's War With Militant Islam.

Chris Matthews

Tonight Stephen welcomes the host of Hardball, Chris Matthews.

Robert Baer

Tonight Stephen welcomes form CIA agents and author of Blow the House Down, Robert Baer.

Christopher Noxon

Tonight Stephen welcomes actor, performer, rapper, playwright and educator Will Power.

Amy Sedaris

Tonight Stephen welcomes Amy Sedaris, star of Strangers with Candy.

Tony Hawk

Tonight Stephen welcomes skateboarding legend Tony Hawk.

Mort Zuckerman

Tonight former defense analyst Daniel Ellsberg.

Ron Suskind

Tonight Stephen welcomes back Arianna Huffington, blogger and author of On Becoming Fearless...in Love, Work, and Life

Lee Silver

Tonight Stephen welcomes actor Ted Danson.

Dhani Jones

Tonight Stephen welcomes Pulitzer Prize winning investigative journalist and the Reva and David Logan Distinguished Professor at UC Berkeley's Graduate School of Journalism, Lowell Bergman.

Joe Scarborough

Tonight Stephen welcomes the host of Scarborough Country, Joe Scarborough.

Tom Brokaw

Tonight Stephen welcomes former NBC Nightly News anchor Tom Brokaw.

Howell Raines

Tonight Stephen welcomes journalist and author of The One That Got Away: A Memoir, Howell Raines

William Donohue

Tonight Stephen Welcomes the president of the Catholic League, William Donohue.

Neal Katyal

Tonight Stephen welcomes Democracy Now! host and co-author of Static: Government Liars, Media Cheerleaders, and the People Who Fight Back, Amy Goodman.

Joe Quesada

Tonight Stephen welcomes musician Randy Newman.

Ned Lamont

Tonght, Democratic hopeful for Senate in Connecticut, Ned Lamont.

Peter Beinart

Tonight former editor for the New Republic and author of The Good Fight: Why Liberals--And Only Liberals--Can Win the War On Terror and Make America Great Again, Peter Beinart.

Linda Hirshman

Tonight former attorney and professor of philisophy Linda R. Hirshman, author of Get to Work: A Manifesto for Women in the World.

Paul Hackett III

Tonight Stephen welcomes lawyer and co-founder of the Innocence Project, Barry Scheck.

Bill Rhoden

Tonight, New York Times columnist and author of Forty Million Dollar Slaves: The Rise, Fall and Redemption of the Black Athlete, Bill Rhoden.

Alexandra Robbins

Tonight cultural anthropologist Alexandra Robbins, author of The Overachievers: The Secret Life of Driven Kids.

Eli Pariser

Tonight campaign director for MoveOn.org, Eli Pariser.

Ramesh Ponnuru

Tonight Stephen welcomes Ramesh Ponnuru, senior editor of the National Review and author of The Party of Death: The Democrats, the Media, the Courts and the Disregard for Human Life.

David Gergen

Tonight Stephen welcomes political commentator of PBS's NewsHour with Jim Lehrer and author of Eyewitness to Power: The Essence of Leadership Nixon to Clinton, David Gergen.

Morgan Spurlock

Tonight Stephen welcomes documentary filmmaker and host of 30 Days, Morgan Spurlock.

Neil Young

Tonight Stephen welcomes legendary musician Neil Young.

Geoffrey Nunberg

Tonight Stephen welcomes Geoffrey Nunberg, professor of linguistics and columnist for the New York Times and author of Talking Right: How Conservatives Turned Liberalsim into a Tax Raising, Latte-Drinking, Sushi-Eating, Volvo-Driving, New York Times-Reading, Body Piercing, Hollywood Loving, Left-Wing Freak Show.

Paul Krugman

Tonight Stephen welcomes economist and colmnist Paul Krugman, author of The Great Unraveling: Losing Our Way in the New Century.

Gideon Yago

Tonight Stephen welcomes writer and correspondent for MTV News, Gideon Yago

Janna Levin

Tonight Stephen welcomes mathematician Janna Levin, author of A Madman Dreams of Turing Machines.

Martin Short

Tonight Stephen welcomes comedian Martin Short.

Toby Keith

Tonight Stephen welcome country music star Toby Keith.

Ken Jennings

Tonight Stephen welcomes record setting Jeopardy champion and author of Brainiac: Adventures in the Curious, Competetive, Compulsive World of Trivia Buffs, Ken Jennings

Bill Simmons

Tonight Stephen welcomes ESPN's Sports Guy columnist and author of Now I Can Die In Peace: How ESPN's Sports Guy Found Salvation with a Little Help from Nomar, Pedro, Shawshank, and the 2004 Red Sox, Bill Simmons

Will Power

Tonight Stephen welcomes actor, performer, rapper, playwright and educator Will Power.

Frank Rich

Tonight Stephen welcomes New York Times columnist Frank Rich, author of The Greatest Story Ever Sold: The Decline and Fall of Truth from 9/11 to Katrina.

James Carville

Tonight Stephen welcomes Democratic political consultant James Carville.

Daniel Ellsberg

Tonight former defense analyst Daniel Ellsberg.

Arianna Huffington

Tonight Stephen welcomes back Arianna Huffington, blogger and author of On Becoming Fearless...in Love, Work, and Life

Ted Danson

Tonight Stephen welcomes actor Ted Danson.

Lowell Bergman

Tonight Stephen welcomes Pulitzer Prize winning investigative journalist and the Reva and David Logan Distinguished Professor at UC Berkeley's Graduate School of Journalism, Lowell Bergman.

Steve Wozniak

Tonight Stephen welcomes co-founder of Apple Computers, Steve Wozniak.

Michael Lewis

Tonight Stephen welcomes Michael Lewis, author of The Blind Side: Evolution of a Game.

Andy Stern

Tonight Stephen welcomes union leader and author of A Country That Works: Getting America Back on Track, Andy Stern.

Senator Byron Dorgan

Tonight Stephen welcomes North Dakota Senator Byron Dorgan, author of Take This Job and Ship It: How Corporate Greed And Brain-Dead Politics Are Selling Out America.

Amy Goodman

Tonight Stephen welcomes Democracy Now! host and co-author of Static: Government Liars, Media Cheerleaders, and the People Who Fight Back, Amy Goodman.

Randy Newman

Tonight Stephen welcomes musician Randy Newman.

Ariel Levy

Tonight Stephen welcomes journalist and author of Female Chauvinist Pigs: Women and the Rise of Raunch Culture, Ariel Levy.

George Lucas

Tonight Stephen reveals the winner of the Green Screen Challenge. Plus, another Tek Jansen Adventure.

Gov. Brian Schweitzer

Tonight Stephen welcomes Montana Governor Brian Schweitzer

Barry Scheck

Tonight Stephen welcomes lawyer and co-founder of the Innocence Project, Barry Scheck.

Richard Dawkins

Tonight Stephen celebrates his 1st anniversary episode with Oxford Professor of Biology and author of The God Delusion Richard Dawkins.

David Kuo

Tonight Stephen welcomes former special assistant to President Bush and author of Tempting Faith: An Inside Story of Political Seduction, David Kuo.

Dr. Peter Agre

Tonight Stephen welcomes Nobel Prize winning chemist Dr. Peter Agre. Plus Stephen talks to Jim Gilchrist, founder of The Minuteman Project.

Barry Manilow

Tonight Stephen welcomes musician Barry Manilow.

Tim Robbins

Tonight Stephen welcomes actor and politcal activist Tim Robbins.

Penn Jillette

Tonight Stephen welcomes magician Penn Jillette.

Ronald Reagan Jr.

Tonight Stephen welcomes political activist Ronald Reagan Jr.

Mark Halperin

Tonight Stephen welcoms ABC News correspondent and co-author of The Way to Win: Taking the White House in 2008, Mark Halperin.

Indecision 2006 Election Coverage

Combined with the Daily Show for the night, Stephen talks to Warren Beatty by phone, Rep. Robert Wexler via satellite and Rep. Eleanor Holmes Norton via satellite.

Jeff Greenfield

Tonight Stephen welcomes CNN anchor Jeff Greenfield.

Dean Kamen

Tonight Stephen welcomes the founder of FIRST and President of DEKA Research and Development Corporation, Dean Kamen.

Dan Rather

Tonight Stephen welcomes former CBS News anchor Dan Rather.

Jeff Swartz

Tonight Stephen welcomes CEO of Timberland, Jeff Swartz.

Al Franken/Dr. Michael Novacek

Tonight Stephen welcomes Al Franken and paleontologist Dr. Michael Novacek.

Richard Linklater

Tonight Stephen welcomes Richard Linklater, director of Fast Food Nation.

Jim Lehrer

Tonight Stephen welcomes PBS News Hour anchor and author of The Phony Marine: A Novel, Jim Lehrer.

Harry Shearer

Tonight Stephen welcomes comedian Harry Shearer.

Nora Ephron

Tonight Stephen welcomes screenwriter and author of I Feel Bad About My Neck: And Other Thoughts on Being a Woman, Nora Ephron.

Mike Lupica

Tonight Stephen welcomes ESPN commentator and author of Miracle on 49th Street, Mike Lupica.

Will Wright

Tonight Stephen welcomes computer game designer Will Wright.

Steven D. Levitt

Tonight Stephen welcomes economist and co-author of Freakonomics: A Rogue Economist Explores the Hidden Side of Everything, Steven D. Levitt.

John Sexton

Tonight Stephen welcomes the president of New York University, John Sexton.

Dr. Francis S. Collins

Tonight Stephen welcomes the fromer head of the Human Genome Project and author of The Language of God: A Scientist Presents Evidence for Belief, Francis Collins.

Dan Savage

Tonight Stephen welcomes nationally syndicated columnist and author of The Commitment: Love, Sex, Marriage, and My Family, Dan Savage.

Doris Kearns Goodwin

Tonight Stephen welcomes historian and author of Team of Rivals, The Political Genius of Abraham Lincoln, Doris Kearns Goodwin.

Daniel Pinchbeck

Tonight Stephen welcomes a writer for the Village Voice and Rolling Stone and author of Breaking Open the Head: A Psychedelic Journey into the Heart of Contemporary Shamanism, Daniel Pinchbeck.

Jack Welch

Tonight Stephen welcomes the retired CEO of General Electric, Jack Welch.

Deepak Chopra

Tonight Stephen welcomes the leader in the field of mind body medicine, Deepak Chopra.

Chris Funk, Robert Schneider

Stephen Colbert vs the Decemberists.