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 RubioRubio: Trump's remarks on Russian election meddling 'not accurate' The Hill's Morning Report — Trump, Putin meet under cloud of Mueller’s Russia indictments Scottish beer company offering ‘tiny cans’ for Trump’s ‘tiny hands’ 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 RyanGOP lambasts Trump over performance in Helsinki Trump stuns the world at Putin summit Former Trump aide says he canceled CNN appearance over 'atrocious' Helsinki coverage 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 moderates hint at smooth confirmation ahead for Kavanaugh Sens introduce bipartisan bill matching Zinke proposed maintenance backlog fix On The Money: Trump backs off investment restrictions on China | McConnell opens door to tariff legislation | Supreme Court deals blow to public-sector unions, ruling against 'fair-share' fees 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.