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

• CNN, Fox News, MSNBC, and C-SPAN have Election Coverage all night.
• At 8, FOX has a new American Idol, followed by the series premiere of New Amsterdam.
• ABC has a new Just For Laughs at 8.
• NBC has a new, two hour Biggest Loser at 8.
• TCM has Hitchcock's Spellbound at 8.
• At 9, CBS has a new Big Brother, then a new Jericho.
• The CW has a new One Tree Hill at 9.
• Also at 9: Food Network has a new Throwdown with Bobby Flay.
• At 9:30, HBO has a new In Treatment.
• At 10, Travel Channel has a new Bizarre Foods with Andrew Zimmern.

Check your local TV listings for more.