Poll: Which American President had or has the most productive/interesting retirement?

The poll has closed for the question, "Which American President had or has the most productive/interesting retirement?" Thanks to all who participated by voting. The options were Thomas Jefferson, Ulysses S. Grant, Herbert Hoover, Jimmy Carter, and Other.

Jimmy Carter won easily with 47%. Other came in a distant second with 17%. Jefferson pulled in 15% while Grant had 10%. Hoover came in last with 8%.