Rick Santorum

WASHINGTON (AP) — The head of the Republican Governors Association says Rick Santorum's withdrawal from the presidential sweepstakes should signal party conservatives to unify behind Mitt Romney

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Bowing to the inevitable, Rick Santorum quit the presidential campaign Tuesday, clearing the way for Mitt Romney to claim the Republican nomination.

Santorum, appearing with his wife and family in his home state of Pennsylvania, told supporters the race for him was over, but the fight to defeat President Barack Obama would go on

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WASHINGTON (AP) — Sen. John McCain says Rick Santorum should recognize "it's time for a graceful exit" from the Republican presidential campaign in the wake of Mitt Romney's sweep of primaries in Wisconsin, Maryland and the District of Columbia

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BROOKFIELD, Wis. (AP) — Well-traveled routes that serve as Wisconsin's vital arteries also provide a window into the competing hopes for Mitt Romney and Rick Santorum.

Romney can roll up a solid win in Tuesday's presidential primary with a strong showing along the state's east-west Interstate 94, which bisects Milwaukee's GOP-rich western suburbs

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WASHINGTON (AP) — Mitt Romney and Rick Santorum are trying to make the most of a mixed Super Tuesday, each claiming a measure of victory but unable to settle the most tumultuous race for the GOP presidential nomination in decades

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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

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