Which Presidents were the products of cousin marriage?

[phk]

Same as topic.

[Oldiesfreak1854]

FDR and Eleanor Roosevelt were cousins.

[FEMA Camp Administrator]

Given the hundreds upon hundreds of years of human history, it's possible all of them at some point down the line. Remember, we were once a roaming nomadic people, not beholden to many moral codes. And especially if any of the Presidents at one point had an ancestor from Greece or Rome.

[J. J.]

Both Harrisons, John Quincey Adams, and JFK.  John Adams, Van Buren, and FDR all married a distant cousin.