Mitt Romney's lead over Rick Santorum in national Republican registered voters' preferences has increased to 16 percentage points. Romney has now overtaken Santorum among conservatives and weekly churchgoers.

Rick Santorum, despite being a Catholic, does significantly less well among Catholic Republicans nationally than does Mitt Romney, who is a Mormon. Santorum, on the other hand, does better than Romney among Protestants.

The impact of Newt Gingrich's now reverberating Meet the Press comments about fellow Republican Rep. Paul Ryan's proposed Medicare fix -- "I don't think right-wing social engineering is any more desirable than left-wing social engineering," and ...

Most Republicans prefer that one of the four GOP candidates clinch the nomination before the convention rather than letting the convention pick someone else, even though less than half are pleased with the current group of candidates.

Rick Santorum now leads Mitt Romney by 36% to 26% among national Republicans in Gallup Daily tracking, even as a clear majority of Republicans believe Romney has the best chance of beating Barack Obama in November.

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Of the major presidential candidates, Americans perceive Jon Huntsman, Mitt Romney, and Ron Paul as closest to them ideologically, and Barack Obama and Michele Bachmann as the furthest. Americans view Bachmann as the most conservative Republican ...

Former Pennsylvania Sen. Rick Santorum, the latest Republican to announce the formation of a presidential exploratory committee, is recognized by 43% of Republicans nationwide. He has a Gallup Positive Intensity Score of 13, average across the ...

The leading candidate in nationwide Republican nomination preferences after the New Hampshire primary has won the GOP nomination in recent elections. Typically, national Republicans' preferences have changed after the Iowa and New Hampshire ...