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WASHINGTON (AP) -- President Barack Obama is keeping up a schedule of weekly visits to politically important states with a trip Wednesday to North Carolina....

WASHINGTON (AP) -- Republicans in 10 states weighed in on the GOP presidential nomination race in its busiest day yet. Mitt Romney won six states, Rick Santorum clinched three and Newt Gingrich prevailed in one. And along the way, clues were gleaned from the results about the path ahead. A look at what we learned:...

WASHINGTON (AP) -- Former Massachusetts Gov. Mitt Romney won all 20 delegates at stake in Puerto Rico's Republican presidential primary Sunday, adding to his lead in the race for delegates to the party's national convention....

WASHINGTON (AP) -- Former Massachusetts Gov. Mitt Romney padded his lead in the race for delegates Tuesday by winning Republican presidential contests in six states....

WASHINGTON (AP) -- Former Massachusetts Gov. Mitt Romney padded his lead in the race for delegates Tuesday by winning Republican presidential contests in six states....

WASHINGTON (AP) -- As Mitt Romney reflects on his showing on Super Tuesday, he might sneak a peek at clips of President Barack Obama's news conference performance hours earlier. It was an object lesson about the power of incumbency and about the challenge facing Romney while his own party foes still nip at his heels....

WASHINGTON (AP) -- The ten states holding contests Super Tuesday offered Mitt Romney, Rick Santorum and Newt Gingrich each something to celebrate. What the contests didn't do is clarify the Republican contest....

WASHINGTON (AP) -- The ten states holding contests Super Tuesday offered Mitt Romney, Rick Santorum and Newt Gingrich each something to celebrate. What the contests didn't do is clarify the Republican contest....

WASHINGTON (AP) -- The ten states holding contests Super Tuesday offered Mitt Romney, Rick Santorum and Newt Gingrich each something to celebrate. What the contests didn't do is clarify the Republican contest....

WASHINGTON (AP) -- The ten states holding contests Super Tuesday offered Mitt Romney, Rick Santorum and Newt Gingrich each something to celebrate. What the contests didn't do is clarify the Republican contest....

WASHINGTON (AP) -- The ten states holding contests Super Tuesday offered Mitt Romney, Rick Santorum and Newt Gingrich each something to celebrate. What the contests didn't do is clarify the Republican contest....

WASHINGTON (AP) -- The ten states holding contests Super Tuesday offered Mitt Romney, Rick Santorum and Newt Gingrich each something to celebrate. What the contests didn't do is clarify the Republican contest....

WASHINGTON (AP) -- Mitt Romney is adding one more victory to his Super Tuesday showing - the Alaska caucuses....

WASHINGTON (AP) -- Mitt Romney is adding one more victory to his Super Tuesday showing - the Alaska caucuses....

WASHINGTON (AP) -- Mitt Romney is adding one more victory to his Super Tuesday showing - the Alaska caucuses....

WASHINGTON (AP) -- Moderate, secular and well-educated people propelled Mitt Romney to victory in Ohio's Republican presidential primary on Tuesday, an exit poll of voters showed. Rick Santorum drew robust support from the state's most ardent conservatives and eked out a modest margin among the working class, whom he has targeted in his drive to slow Romney's march toward the GOP nomination....

HARRISBURG, Pa. (AP) -- Rick Santorum is taking a break from the presidential campaign trail to observe the Easter holiday....

WASHINGTON (AP) -- GOP presidential candidate Rick Santorum's hospitalized daughter could be released Monday, his campaign said....

WASHINGTON (AP) -- Mitt Romney has won Ohio's Republican presidential primary, narrowly defeating Rick Santorum in the most critical and hard-fought of the Super Tuesday contests....

WASHINGTON (AP) -- Mitt Romney won in the Northeast on Super Tuesday, while Rick Santorum and Newt Gingrich picked up victories in Southern states - results that showcased the vastly different slices of the Republican electorate that headed to the polls....