CUYAHOGA FALLS, Ohio (AP) — Rick Santorum is facing a crucial test in Ohio, where he's drawing upon his working-class background and underdog image to help stop Mitt Romney from scoring a pivotal victory in Super Tuesday's premier contest.

An unapologetic social conservative, Santorum has cast the race in Biblical terms: He's David vs. Romney's Goliath.

The former senator from neighboring Pennsylvania has a shell of a campaign in Ohio, with no state headquarters and a barebones staff. In Romney he faces a challenger who enjoys a massive cash advantage and a political machine that's produced high-stakes victories in other states when his front-runner status was in doubt.

Santorum expects to be competitive in several states Tuesday — Tennessee, Oklahoma and Georgia among them. Ohio remains the state that could reshape the GOP race.

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