Republicans favor former Secretary of State Condoleezza Rice for Mitt Romney's running mate, according to a survey released Wednesday by Fox News.

The former George W. Bush Administration official was the pick of three in 10 Republicans, leading Sen. Marco RubioMarco Antonio RubioTrump must send Russia powerful message through tougher actions McCain, Coons immigration bill sparks Trump backlash Taking a strong stance to protect election integrity MORE (R-Fla.), the favorite of 19 percent of those surveyed; New Jersey Gov. Chris Christie, the choice of 8 percent; and Rep. Paul RyanPaul Davis RyanMcConnell: 'Whoever gets to 60 wins' on immigration Overnight Defense: Latest on spending fight - House passes stopgap with defense money while Senate nears two-year budget deal | Pentagon planning military parade for Trump | Afghan war will cost B in 2018 House passes stopgap spending measure with defense money MORE (R-Wis.), who garnered 8 percent.

Speculation has swirled around Rice since a story was posted to the Drudge Report last week that said she had become a front-runner in Romney's search for a running mate.

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On Wednesday, Romney told a town-hall audience in Ohio that he had not yet picked a vice presidential candidate, but his eventual choice would be a "conservative."

"I can assure you that even though I have not chosen the person that will be my vice president, that person will be a conservative; they will believe in conservative principles," Romney said.

Some Republicans have argued that Rice's support for abortion rights should disqualify her from being on the ticket. Romney has said he would pick a running mate who opposes abortion rights.

Of late, the majority of vice presidential speculation has centered around former Minnesota Gov. Tim Pawlenty, Sen. Rob PortmanRobert (Rob) Jones PortmanGOP leader: Congress may settle for pared-down immigration deal Senate Republicans call on Trump to preserve NAFTA Key senator floats new compromise for immigration talks MORE (Ohio) and Louisiana Gov. Bobby Jindal — but none of the three cracked double digits among the Republican voters surveyed by Fox. 

Jindal was the most popular, earning 5 percent of those surveyed, while Portman was the choice of 3 percent of voters and Pawlenty a mere 2 percent.