The day originally celebrates George Washington, but now also other presidents. By way of discussion, it might be interesting to hear who you think were the best of the minor presidents (and why). The major ones, ranked by effect for good or ill on the nation, should include:
JFK might also be included if only because of his psychic effect on his generation and the one that followed. Nixon might be included for opening China and getting himself forced to resign, which also provoked a psychic effect that was harmful. Carter definitely produced a psychic effect, but I believe he was too pitiful as president to make anybody's list of "best minor presidents."