Thomas Jefferson served as the 3rd President of the United States from:
March 4, 1801 – March 4, 1809
He served two terms, following John Adams and preceding James Madison.
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1800 Election: Defeated John Adams in a famously bitter and complicated race (resulting in a tie with Aaron Burr that had to be settled by the House of Representatives).
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1804 Election: Re-elected in a landslide against Charles Cotesworth Pinckney.