Andrew Jackson. At 13, he was a messenger with the Continental Army during the American Revolution, and was captured by the British.
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James Knox Polk is the only US President to have held that office.
Iowa is the first caucus, which is held in January.
As of 2009 there have been 16
Andrew Johnson was the only ex-president to return to the US Senate.
In the US, the offices of President and vice-president are the only nationally elected offices.