Guests: Financial Times editor Chrystia Freeland, journalist Tina Brown, Rep. Maxine Waters (D-CA); via satellite, Rep. Ron Paul (R-TX), journalist Brigitte Gabriel

Guests: Actor Alan Cumming, political satirist and journalist P. J. O'Rourke, Mayor Gavin Newsom (D-San Francisco); via satellite, political correspondent George Stephanopoulos, author Robin Wright

Guests: Businessman T. Boone Pickens; Mayor Cory Booker (D-Newark); news anchor Erin Burnett; author Peter Singer

Guests: Comedian Sarah Silverman, professor Michael Eric Dyson, author Andrew Breitbart, columnist Steven Pearlstein

Guests: Fmr. Sec. of State Madeleine Albright, television host Keith Olbermann, actress Kerry Washington, senator Bernie Sanders (I-VT), journalist Andrew Ross Sorkin

Guests: Senator Bill Bradley, author Christopher Hitchens, rapper Mos Def, author Salman Rushdie

Guests: Joe the Plumber, Journalist David Frum, comedian Carol Leifer, writer Reihan Salam, reporter Sam Donaldson

Guests: Filmmaker Ron Howard and novelist Gore Vidal

Guests: Ex-gov. Howard Dean (D-VT), comedian Dana Gould, writer Randy Cohen, author Bethany McLean, ex-CIA agent Robert Baer

Guests: Rep. Barney Frank (D-MA), journalist Fareed Zakaria, NBC News foreign correspondent Richard Engel, former FDA chief David Kessler

Guests: Democratic consultant James Carville, Family Guy creator Seth MacFarlane, author Naomi Klein, journalist Matt Taibbi, author Reza Aslan

Guests: Creator of The Wire David Simon, economist Elizabeth Warren, conservative commentator Amy Holmes, National Review's Richard Brookhiser, columnist Dan Savage

Guests: Nobel Prize-winner Muhammad Yunus, Pulitzer Prize-winner and Newsweek editor Jon Meacham, M.I.T. economist Simon Johnson, and rapper M.I.A.

Guests: Actor Hill Harper, former U.N. Ambassador John Bolton, former House Representative Heather Wilson, documentarian Michael Pollan

Guests: Actor and comedian D. L. Hughley, Council of Foreign Relations president Richard Haass, novelist Paula Froelich, journalist Jeremy Scahill, Fortune editor Matt Miller

Guests: CNN host Larry King, MSNBC host Chris Matthews, former White House Homeland Security advisor Frances Townsend, NAACP President Ben Jealous, humorist P. J. O'Rourke

Guests: Commentator Paul Begala, BBC reporter Katty Kay, blogger Meghan McCain, columnist Joel Stein, writer Hooman Maj

Guests: Actress Cameron Diaz, director Oliver Stone, actor Billy Bob Thornton

Guests: Joe Scarborough, actor Jason Alexander, actress/playwright Anna Deavere Smith, Gov. Brian Schweitzer (D-MT), Markos Moulitsas.

Guests: Homeland Security secretary Janet Napolitano (via satellite), Iraq War veteran and California congressional candidate Anthony Woods, Susan Eisenhower, journalist John Heilemann, writer Matt Taibbi

Guests: Journalist Jeff Sharlet, CNN foreign correspondent Michael Ware, MSNBC host Rachel Maddow, economist Niall Ferguson, humorist Joe Queenan

Guests: Huffington Post founder Arianna Huffington, Georgia congressman Jack Kingston, California congressman Darrell Issa, Dr. David Scheiner, President Obama's doctor in Chicago

Guests: Actor Ashton Kutcher, fmr. Commander in Chief of U.S. Central Command Gen. Anthony Zinni (ret.), journalist and blogger Ross Douthat, comedian Dana Gould (also reporter), actor Brad Pitt

Guests: TV host Jay Leno, journalist Chuck Todd, Rep. Jan Schakowsky (D-IL), author Sam Harris, journalist Jeremy Scahill

Guests: Rapper Jay-Z, journalist Bill Moyers

Guests: New York representative Anthony Weiner, comedian Kathy Griffin, author and veterans advocate Paul Rieckhoff, journalist Rajiv Chandrasekaran, former counter-terrorism czar Richard Clarke

Guests: Actor and comedian David Cross, law professor Annette Gordon-Reed, journalist Jeffrey Toobin, journalist Matthew Continetti, fmr. health insurance executive Wendell Potter

Guests: Filmmaker Michael Moore, fmr. New York governor Eliot Spitzer, economist Paul Krugman, director John Waters

Guests: Columnist Thomas Friedman, EPA Chief Lisa Jackson, actress Janeane Garofalo, Ohio congresswoman Marcy Kaptur, author Richard Dawkins

Guests: Former senator Bill Frist, actor Richard Belzer, professor Cornel West, former senator Lincoln Chafee, comedian Sarah Silverman