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Then-US Senator (DE) and current Vice President Joe Biden announced he would seek the Democratic nomincation on March 21, 2006.
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John McCain and Rudy Giuliani both announced that they were forming exploratory committees on November 10, 2006.
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Then-US Senator John Edwards (D-NC) announced that he would be running for president.
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Then-outgoing MA governor and eventual 2012 Republican presidential nominee announced his candidacy for the presidency.
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Current United States President Barack Obama announced his run for president on January 17, 2007.
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Former First Lady of the United States and Sec. of State Hillary Rodhmam Clinton announced that she would be running for the presidency on January 20, 2007.
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Mike Huckabee announced on NBC's 'Meet the Press' that he would be running for president on January 28, 2007.
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Barack Obama wins the Iowa Democratic caucus. Mike Huckabee wins the Iowa Republican caucus.
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Super Tuesday occurs -- Hillary Clinton wins OH, TX, and RI primaries. Obama wins VT primary and TX caucus. John McCain sweeps.
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