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Unable to replicate the success he had in 2012, the former Pennsylvania senator is instead throwing his support behind fellow Republican Marco Rubio.
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Don't expect a parade of once-hopefuls trudging to microphones to quit the day after the caucuses. But the die will have been cast. Iowa doesn't kill candidacies; it puts them on life support.
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The onetime Iowa caucus winner now sits dead last in the state's polls, but Rick Santorum says he's still hoping for another last-minute surge.
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House Speaker John Boehner announced he is stepping down at the end of October. Rank-and-file conservatives reacted with glee — again highlighting the sharp GOP divide.
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There are more Catholic Republicans than ever running for president, but not all have embraced Pope Francis' more liberal statements and theology.
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Republican presidential debates are divided into two tiers, based on where candidates appear in the polls. The lower tier has dwindled to just four candidates in Wednesday night's debate.
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A number of conservative politicians have cast a dim eye on Pope Francis' statements on climate change. A teaching document coming out Thursday aims to make the environment a moral imperative.
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The former Pennsylvania senator, who won Iowa in 2012, hopes he can do it again. But with a more crowded field, he might find it difficult to stand out.
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The former Pennsylvania senator is getting in the race for president again. Here's a reminder of who he is.