#4.... Tough, but I won't cheat.
Lets see, not a single term, not even 2 terms.
I wanna say all attended Yale, b/c iirc Ford did, but so did W, so that's not it.
Several served in the military, but not all...
I'd say they were all born east of the Mississippi, but then there would be more...
Probably don't have the same # of letters in their names...
Most aren't on money...
Too ,any for mt Rushmore...
Hmmm, something they DID?!?! As in a post they held or an act they performed?
Still thinking buti don't mind if you issue a spoiler.