Johnson, Filmore, Tyler, Arthur
John Adams and John Quincy Adams were the first father-son Presidents elected into office.
38 of the 43 US Presidents were elected to the position; the other five (Tyler, Fillmore, A. Johnson, Arthur and Ford ) moved up to fill a vacancy after the president died or resigned and were never actuallly elected to be President. (Four others first took the office by moving up from vice-president, but were then elected to a term of their own.)
Presindent O'Bama is the 44th person to hold the office.
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All but 4 of the 43 Presidents held an elected office before they were President. Those that did not were Taylor, Grant, Hoover and Eisenhower. George Washington did not serve any elected office under the US Constitution, but he was elected to serveral positions in the colonial government. Herbert Hoover was Secretary of Commerce which is a national office, but is not elected.
A president can be elected as many times as he wish
25 presidents form the repulican party were elected to be the president of the USA.
Two presidents held public office in Illinois and lived there when they were elected President and they are Lincoln and Obama. Reagan was born in Illinois but had his career in California. Grant was living in Illinois when he left to fight in the Civil War but he never ran for office in Illinois and was not living there when he ran for President although he may have still owned a house in Illinois .
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Two presidents were Texas residents when elected as President-- Lyndon Johnson and George W, Bush.
A president can only be elected to at most two four-years terms. Further some of them die in office or resign and do not complete their terms,