[The KG9 Kid]

Okay, is that one?

I seem to remember hearing that he was the guy that helped derail George McGovern's 1972 campaign with some off-color remarks to the press.

[Cedric]

He derailed it, alright. He was McGovern’s first VP pick {MO} for a few days until it was revealed that he’d been in an insane asylum and taken, oh, 20 volts or so.

[buccaneer81]

Eagleton was McGovern's first running mate. Then it was revealed that he had been under the care of a shrink. He got the boot, and Sargent Schriver (RFK's brother-in-law) was brought onto the ticket.