Eisenhower
Truman
Reagan
GHW Bush
Kennedy (had he lived, probably higher)
Nixon (His personal demons keep him from being #1)
Johnson (Had he been a Republican would suffer similar fate as RMN)
Clinton
Ford
GW Bush (Ignored domestic issues)
Carter (Could flip with Obama for worst)
Obama (yes! even this early in his term. He may be smart, but I don't think him wise)

I could have ranked Roosevelt, but I only personally remember his war years. Probably would put between Nixon and Clinton.