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The number #45 may have been a tacit nod to Clinton possibly running for president in 2016. If she won, she would be the 45th president of the United States.

Clinton hasn't shut the door on another presidential run. Even on her Twitter account bio she lists "TBD," which observers suspect could signify her planning to run for president.

In May 2008 Buffett endorsed then-Sen. Barack ObamaBarack Hussein ObamaDems flip New York state seat that Republicans have held for nearly four decades Trump denies clemency to 180 people Mellman: Memories may be beautiful, yet… MORE's (D-Ill.) candidacy for president, a month before Clinton dropped out of the race.