Talk Talk: Janet Jackson, Ralph Nader, Jackie Mason

Here's who's on the late night shows tonight.

• Charlie Rose: live coverage of tonight's primaries
• The Daily Show: Ralph Nader
• The Colbert Report: Jennifer 8 Lee
• The Late Show with David Letterman: Colin Farrell, Blake Lively, and Lenny Kravitz (repeat)
• Jay Leno: Heidi Klum, James McAvoy, and John Fogerty (repeat)
• Jimmy Kimmel Live: Janet Jackson, Jackie Mason, and Todd English
• Tavis Smiley: Shelby Lynne and Bruce Bartlett (repeat)
• Late Night with Conan O'Brien: Pink, Lou Dobbs, and Bettye Lavette (repeat)
• The Late, Late Show with Craig Ferguson: Christina Ricci, Dee Dee Myers, and Collective Soul (repeat)
• Last Call with Carson Daly: Kevin Hart and A Fine Frenzy