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President Barack Obama files the necessary paperwork with Federal Election Committee for a hopes of a re-election
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Former Massachusetts Governor Mitt Romney officially declares his candidacy for presidential nomination of the Republican Party.
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Former U.S. Senator Rick Santorum officially declares his candidacy for presidential nomination of the Republican party.
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Rick Santorum wins a narrow victory over Mitt Romney in the Iowa Republican Caucuses.
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Mitt Romney wins the New Hampshire Republican Primary
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Rick Santorum wins the Minnesota Republican Caucuses, the Colorado Republican Caucuses and the Missouri Republican Primary.
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Mitt Romney wins the Connecticut, Delaware, New York, Pennsylvania and Rhode Island Republican Primaries.
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Mitt Romney and Paul Ryan are officially nominated for President and Vice-President of the United States by the Republican National Convention.
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Barack Obama and Joe Biden are officially nominated for President and Vice-President of the United States by the Democratic National Convention.
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Election Day - President Barack Obama is re-elected to a second term.
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The Electoral College formally elects President Obama and Vice President Biden.