The late-night circuit has been a popular route for many GOP candidates for weeks. Below, we take a look at how they've performed.
Mitt Romney on Late Show With David Letterman
The No. 1 thing Mitt Romney would like say to the American people?
"It's a hairpiece," Romney said after counting down the Top Ten Things Mitt Romney Would Like to Say to the American People on "The Late Show with David Letterman" on Monday.
Watch clips of his appearance:
Rick Perry on Late Show With David Letterman
The Texas governor turned up on Letterman's "Top 10" segment in November -- to poke fun at himself the day after an embarassing debate gaffe.
Ron Paul on The Tonight Show With Jay Leno
On Jan. 16, Paul sat down for an extended, late-night interview where he told Jay Leno what he thinks of his GOP competition. (Watch the full interview at NBC.com.)
Jon Huntsman on Saturday Night Live
Huntsman's becoming a late-night veteran -- he poked fun at his campaign's New Hampshire-or-bust strategy on Saturday Night Live in November. This week, he's scheduled to sit down with Letterman on Wednesday.
Michele Bachmann on Late Night with Jimmy Fallon
A minor controversy followed Bachmann's interview on Late Night after the show's house band, The Roots, played Fishbone's Lyin' Ass Bitch during the Minnesota representative's entrance. (Watch part two of the interview at NBC.com.)