Ron Faucheux President of Clarus Research Group, professor and author :
It's easier to lose a debate than to win it. That's because most debate injuries are self-inflicted. Given his current situation, if Perry makes a big mistake, or several small ones, it will do outsized damage to his candidacy by reinforcing negative stereotypes. To "win" tonight, he can't make any errors. He also needs to convey competence and credibility, and show that he can both land and take a hard punch.