In what has been a lively debate full of clashes, one of the biggest has been over immigration. The question, asked by Lorraine Osorio, went first to Mitt Romney.

"What I will do is I’ll put in place an employment verification system and make sure that employers that hire people who have come here illegally are sanctioned for doing so," Romney said. "I won’t put in place magnets for people coming here illegally. So for instance, I would not give driver’s licenses to those that have come here illegally as the president would."