Referendum or Choice, Which Candidate Will Show Fighting Spirit?

… In Charlotte … Mr. Obama demonstrated that perhaps he could win a referendum election after all. And in Denver, Mr. Romney showed that he would have a fighting chance even if voters saw the election as a clash of personalities.

So what does this mean for the final debate, on Monday night in Boca Raton, Fla.? [cont.]

Nate Silver, FiveThirtyEight (NYT)