When you think that almost all Presidents contributed at least *something* to the US - even if they did get impeached at some stage or preferred blowjobs - it's hard to wipe them totally off.
To put it another way - most of them did a lot more than most of us ever will do
Tho... still waiting.. the only exception so far seems to be Young George - damned if I can see even one thing he has done to benefit the US.