Couldn't agree more
but I disagree with your ratings.
Truman was a pretty good president in retrospect but he didn't have a college education. He may have been street smart but he was not an intellectual and his IQ was probably no more than average.
I voted for Bush and I will vote for him or no one in November but he is not in the top five by any stretch.
Clinton, Nixon and Carter might make the top 5 but probably not 123.
If I were betting on IQ score my WAG would be:
FDR
JFK
WJC
RMN
GHWB
Carter
LBJ
DDE
GWB
Truman
Reagan
Ford