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 RubioLobbying world Former Florida congressmen mull bipartisan gubernatorial run: report Winners and losers from Jim Bridenstine’s confirmation as NASA administrator 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 RyanHenry Kissinger, Tim Cook among guests at White House state dinner Overnight Finance: Stocks fall hard | Trump sending delegation to China for trade talks | SEC fines Yahoo M over breach | Dodd-Frank rollback dominates banking conference To keep control of House, GOP must have McCarthy as next Speaker 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 PortmanSenators debate new business deduction, debt in tax law hearing Tax rules will be subject to more OMB review under new memo Ending sex trafficking tomorrow requires preventing child abuse today 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.