Mondale - nice guy with no agenda
Dukakis - nice liberal guy with no agenda
Clinton - oral sex with twenty year old employee
John Edwards - lies about lover/love child while playing for sympathy about dying wife
Al Gore - son of coal wealth plays environment card, cheats, makes millions on Anti-US media.
And you wonder by people voted for George W. Bush!
A few more did. But the game is electoral votes. In 1960 when it was obvious that Dem. vote fixing in Texas and Illinois had turned the election, Nixon decided not to challenge fearing it would leave US leadership in flux. This didn't happen in Bush-Gore. To neither's credit. Gore couldn't even man up to have a phone conversation.
So mediocre beat sleeze.
Or maybe you don't think an a-grabbing, sex harassing cheater is sleezy.