John Edwards

Then a Senator from North California and a strong candidate for Presidency, lost his credibility when his mistress was reported to be pregnant while his wife was dying of cancer. He later admitted that he had fathered a baby girl with his mistress, and his wife died within a year of filing for legal separation after Edwards continued to lie about the affair.

Grover Cleveland

Cleveland’s opponent during the 1884 U.S. Presidential Elections, James Blaine accused him of having an affair and an illegitimate child with Marie Haplin. He knew this because Cleveland paid child support and the child’s surname was Cleveland, though Maria was admitted to a mental asylum after giving birth and the child was adopted to another family.