May 26, 1868: President Andrew Johnson Escapes Conviction By A Single Vote
The first of US President to be impeached, Andrew Johnson remained in office only because the Senate declined to convict him by a vote of 35-19, one ballot shy of the two-thirds majority needed to remove. The episode became one of the chapters in John F Kennedy’s best-selling 1956 book Profiles in Courage.
Wikipedia: https://en.wikipedia.org/wiki/Andrew_Johnson