Guests: Author John O'Sullivan, commentator Amy Holmes, Gov. Brian Schweitzer (Mont.); via satellite, journalist Bill Moyers

Topics: Virginia Tech shooting, gun control, Alberto Gonzalez testimony to Congress, Supreme Court ruling on abortion, Earth Day

Guests: Journalism legend Bill Moyers, journalist Matt Lewis, Former Governor Charles "Buddy" Roemer, Former Governor Jennifer Granholm, Sen. Bernie Sanders (Ind-VT).

Topics: The Republican presidential primaries, Keystone oil pipeline and popular support for important legislation, Newt Gingrich's rise and possible racism, electoral disdain for Mitt Romney, SOPA and PIPA, Republicans' fictionalising president Obama, overcoming partisanship, Citizens United and corporate money in politics, venture capitalism.