4. Grover Cleveland
One of 7 most sexually active presidents in American history is Grover Cleveland. He was married once and he had five children. As it is often the case in the presidential race, the opponent will always try to find the dirty secrets which could harm the reputation of the other candidate. That happened to President Cleveland, the news that he had to pay child support for Oscar Folsom to the widow Maria Crofts Halpin, which meant that he acknowledged the illegitimate child born outside the marriage. That was big news that shook the US at the time.

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