Is this the straw that broke Macaca's back?

As you've probably heard, Larry Sabato, establishment political analyst and election forecaster, was on Hardball tonight. And he said whether Sen. Allen's denies it today or not, Allen did use the N-word in college. Here's a short video of the exchange in question. (Both men graduated from UVA in 1974.)

You'll remember that just this morning, Allen pointedly denied reports in Salon that he was a regular user of the racial epithet in college.

Late Update: You can see the full segment here from MSNBC. See it all, Sabato says a lot more, none of it good for Allen.