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The former Pennsylvania senator, who has been Mitt Romney's main challenger in recent weeks for the 2012 Republican presidential nomination, pitched himself as the one true conservative in the race.
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Mitt Romney's campaign asked broadcasters in Pennsylvania to stop running the campaign's anti-Rick Santorum ad as soon as possible. The move was made "out of deference to Sen. Santorum's decision to suspend his campaign," according to a Romney campaign spokeswoman.
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There's a question whether Rick Santorum will prolong his presidential campaign to finish in Pennsylvania later this month. Mitt Romney, on the other hand, is moving in for the kill, buying $1.8 million of airtime in the state. NPR's Mara Liasson reports on the state of the GOP nominating campaign.
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While it is technically true that Mitt Romney has not yet reached the halfway mark to the 1,144 delegates he needs to clinch the nomination, the math underlying the remaining contests sets up a glide path for him and a stone wall for Rick Santorum.
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Mitt Romney's sweep in Tuesday's GOP primaries essentially signals the beginning of the general election campaign. President Obama joins the fray, attacking Romney by name; Romney returns the favor a day later. Paul Ryan draws attention from the president as well as those speculating on the GOP ticket.
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Rick Santorum met privately with a group of conservative leaders on Thursday to discuss the road ahead for Santorum's Republican presidential campaign. The meeting came as polls tighten in Santorum's home state of Pennsylvania, which holds its primary on April 24.
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Support for Mitt Romney has surged in Pennsylvania as Rick Santorum's has flagged... Santorum is taking an Easter break from the campaign trail, spurring speculation that he may be considering dropping out... Coca Cola and PepsiCo have dropped their membership in the American Legislative Exchange Council.
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Calls for Rick Santorum to leave the Republican race only increased after he failed to win any of Tuesday's primaries. But if Santorum and his team were close to taking that advice, that didn't come across in an interview NPR's Audie Cornish, an All Things Considered co-host, conducted with John Brabender, a top adviser to the former U.S. senator from Pennsylvania.
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A defiant Rick Santorum dismissed calls to drop out and predicted he'll win the next contest in his home state of Pennsylvania on April 24. A look at what Santorum faces as the race heads to his backyard.
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Rick Santorum came surprisingly close to an upset in Tuesday's Wisconsin primary, losing to Mitt Romney by less than 5 percentage points. It was not as heartbreakingly close as his previous losses in Michigan and Ohio, but it was one more reminder of what might have been.