Rick Santorum has pulled ahead in Ohio with more than half the precincts reporting for the Republican presidential nomination in the hotly contested Super Tuesday state.
The former Pennsylvania senator had 38 percent of the votes with unofficial returns in from 55 percent of Ohio's precincts. Mitt Romney was running more than 10,000 votes behind at 36 percent.
Santorum hoped to rejuvenate his bid to overtake Romney for the GOP nomination by claiming his biggest primary prize yet, while Romney hoped to add another key November swing state to bolster his front-runner status.
Former House speaker Newt Gingrich was a distant third at 15 percent, in the state that lies between Romney's native Michigan and Santorum's home state. Texas Rep. Ron Paul was running last at 9 percent.