Sen. Marco Rubio remains the third choice to picked as Mitt Romney's running mate, according to the online oddsmakers.

Rubio is behind fmr. Minnesota Gov. Tim Pawlenty and Sen. Rob Portman from Ohio. lists Pawlenty and Portman at 2.2-to-1 odds. That means that if you bet $100 on Pawlenty or Portman to get picked, and they get picked, you would win $220 plus your initial investment of $100 or $320 total.

Rubio is next at 3-to-1 odds.

Former U.S. Sec. of State Condoleeza Rice is fourth at 10-to-1 odds. does not list Gen. David Petraeus among the contenders, even though he has been touted recently as a surprise contender for the VP slot.