It's a dead heat between Rick Santorum and Mitt Romney in Ohio, one of the biggest delegate prizes of the 10 states voting on Super Tuesday, according to a new NBC News/Marist Poll.
Santorum leads Romney 34% to 32% among likely Republican primary voters, with Newt Gingrich (15%) and Ron Paul (13%) in the back of the pack.
Eleven percent of voters said they might change their vote by primary day on Tuesday. On the question of voters' second choice, Romney, Santorum and Gingrich were essentially tied.
Once again, Romney's strength lies in the question of electability. Fifty-seven percent of likely voters said it was more important that the Republican nominee be able to beat President Obama, while 36% said it was more important that he be a true conservative. Fifty-three percent said Romney was the candidate with the best chance of beating Obama. Thirty-five percent said Santorum was the "true conservative" in the race, while only 11% said that of Romney.