You’re missing the point: most presidents, except Clinton, NEVER have anybody coming out of their past to talk about them. And the only reason Clinton did is because he lived life tabloid style, we creates tabloid fodder. Most normal folks don’t really want to go talking to the press, if somebody I’ve known somehow because president I wouldn’t go to the press and if they came to me all my answers would be of the threatening variety.
Could you be more specific about what you mean? We have had countless biorgraphies on Presidents including while they were holding the office. People were interviewed all of the time about the President's early life, schoolmates, elective office positions, etc. And some people in their past have had some rather derrogatory remarks to make about them.
Top 10 Presidential Scandals, Here are a couple of them
Andrew Jackson's marriage--Before Andrew Jackson was president, he married a woman named Rachel Donelson in 1791. She had previously been married and believed that she was legally divorced. However, after marrying Jackson, Rachel found out this was not the case. Her first husband charged her with adultery. Jackson would have to wait until 1794 to legally marry Rachel. Even though this happened over thirty years previously, it was used against Jackson in the election of 1828. Jackson blamed Rachel's untimely death two months before he took office on these personal attacks against him and his wife.
Grover Cleveland had to deal head on with a scandal while he was running for president in 1884. It was revealed that he had previously had an affair with a widow named Maria C. Halpin who had given birth to a son. She claimed that Cleveland was the father and named him Oscar Folsom Cleveland. Cleveland agreed to pay child support and then paid to put the child in an orphanage when she was no longer fit to raise him. When this issue was brought forth in the campaign and even became a chant "Ma, Ma, where's my Pa? Gone to the White House, ha, ha, ha!," Cleveland was honest about the entire affair. This helped rather than hurt him, and he won the election.
And here are a few more:
Thomas Jefferson's alleged relationship with Sally Hemmings was the first presidential sex scandal in the United States and prompted a discussion that continues to this day. In 1802 Jefferson was charged with having an affair with his slave, Sally Hemmings, and in fact fathering a child. Jefferson denied the charges and remained as president for another 7 years, however the debate about the truth of the matter continued until 1998 when DNA testing proved that Jefferson more than likely fathered at least one of Sally Hemming's children.
Warren Harding had a reputation as a lady's man. Rumors circulated that the GOP paid one mistress to stay quiet during his campaign, while another girlfriend, Nan Britton, was raising his illegitimate child. Harding reportedly maintained his relationship with Britton, paying child support and continuing the affair, sometimes in an anteroom of the Oval Office.
This is completely untrue. If you look [not very far], you will find many personal details, testimonials, and complaints from former teachers, friends, girlfriends, ... on ALL of the previous Presidents.