The Washington Times - April 4, 2012, 11:40AM

With Mitt Romney appearing to have a lock on the GOP’s presidential nomination, the betting — literally — has begun on whom he might choose tap as his running mate, and the early money is on Florida freshman Sen. Marco Rubio.

Mr. Rubio last week ruled himself out of contention, saying he doesn’t see himself being on a ticket. But Paddy Power, Ireland’s largest bookmaker, rates him at 2-1 odds, putting him well above New Jersey Gov. Chris Christie at 5-1, New Mexico Gov. Susana Martinez at 11-2 and, in the shocker of the group, Sen. Rand Paul at 15-2.

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Foremer Pennsylvania Sen. Rick Santorum, Mr. Romney’s chief rival for the GOP’s presidential nomination, is given odds of 20-1, while former House Speaker Newt Gingrich is at 40-1 and Rep. Ron Paul, another presidential candidate and father of the senator, is a 50-1 longshot.