Marco Rubio is the Odds-On Favorite to Be Mitt Romney's VP

U.S. Sen. Marco Rubio, R-Fla., is the favorite to be Mitt Romneys running mate according to Paddy Power, the largest bookmaker in Europe, which released odds on the veepstakes on Wednesday morning.

After Romneys sweep of three primary contests in Maryland, Washington, D.C., and Wisconsin on Tuesday, Paddy Power is ready to concede the nomination to the former governor of Massachusetts and look to the general election against President Barack Obama.

Romneys latest victories have put him in a very strong position and, with his focus now turning to Obama, I wouldnt be surprised if he already had his running mate in mind, said a spokesman for Paddy Power after Romneys wins.

Rubio, who endorsed Romney last week, ranks as the overwhelming favorite from Paddy Power with 2-1 odds. Gov. Chris Christie of New Jersey, also a Romney backer, garners 5-1 odds. Gov. Susana Martinez of New Mexico is also in the mix with 11-2 odds. So is U.S. Sen. Rand Paul of Kentucky, despite his father -- U.S. Rep. Ron Paul of Texas -- remaining in the race. Paul gets 15-2 odds. U.S. Rep. Paul Ryan of Wisconsin, who backed Romney last week and is best known for leading the House Budget Committee, garners 9-1 odds while another Romney supporter -- Gov. Bob McDonnell of Virginia -- is a 10-1 underdog.