Top 5 Picks for Romney Running Mate Marco Rubio, Chris Christie lead Intrade's bets By Matt Cantor, Newser User Posted Apr 6, 2012 3:56 PM CDT 49 comments Comments In this Oct. 5, 2011, file photo, Sen. Marco Rubio, R-Fla., speaks in Washington. (AP Photo/Haraz N. Ghanbari, File) (Newser) – There's no way of knowing who will join Mitt Romney on the GOP ticket—but Intrade is willing to guess. The online futures site offers odds on various contenders, and the Daily Beast takes a look at the top five: Marco Rubio, 24.9%. The Florida senator is a Cuban-American who's hugely popular among conservatives in the swing state. On the downside, he has only two years' experience and was at one time a Mormon, which may worry evangelicals. Chris Christie, 10.9%. The New Jersey governor appeals to both centrists and the GOP base, an unusual feat. But he has said he's not prepared for the presidency, and he can be a loose cannon. Bob McDonnell, 9.9%. The Virginia governor comes from a swing state and he'd boost the ticket's conservative credentials. But his social conservatism might go too far: He's taken heat over issues such as the state's ultrasound bill. Yes, Paul Ryan makes the cut, too: Click for the full list.