I'm not sure why. Maybe his campaign is flailing so badly they felt the need to shore up their support in the Stone Cold demographic. Maybe getting fifty thousand Harleys to rev their engines is part of his new "Fuck It, Let's Tap This Bitch Dry" energy plan.
Or maybe, just maybe, this is part of his effort to win over all those women who supported Hillary Clinton in the Democratic Primary:
McCain felt so comfortable at the event that he even volunteered his wife for the rally’s traditional beauty pageant, an infamously debauched event that’s been known to feature topless women.I guess once you've called your (second) wife a "cunt" and a "trollop," it's not that far a step to ask her to slut it up in hopes of getting some votes.
“I encouraged Cindy to compete,” McCain said to cheers. “I told her with a little luck she could be the only woman ever to serve as first lady and Miss Buffalo Chip.”
Personally, I think McCain's so steeped in shoveling bullshit this season that getting his wife to win the "Miss Buffalo Chip" title just seemed like a natural extension.
Update: It's actually worse than I thought. Here's a clip of last year's Miss Buffalo Chip contest. Call me an elitist, but holy fucking Christ is it inappropriate for a presidential candidate to say his wife should be in this thing.