Former United States presidents who ran for office after leaving the presidency

I was teaching a year 13 politics lesson today when a student asked if a President serving two terms could run for Congress afterwards.

At the time I didn't know the answer to the question. Thankfully, my old friend Professor Google provided the answer.

Only two former presidents have successfully run for Congress. John Quincy Adams (President 1825-9) entered the House of Representatives in 1830 and won 9 elections there until his death in 1846.

John Quincy Adams (sixth President of the United States)

Andrew Johnson (President 1865-9) ran for the Senate in 1868 but lost. He tried again in 1874 but this time he won, and served in the Senate until his death.

Andrew Johnson (seventeenth President of the United States and first American to be impeached - he was acquitted)