The last question of Tuesday's debate was submitted by Peggy Silva, a high school teacher from Amherst, New Hampshire. The question was "What don't you know and how will you learn it?"
According to today's Nashua Telegraph:
Tom Brokaw is a friend of Silva's daughter's father-in-law, who e-mailed Brokaw right away to tell him who asked the final question.
Silva also has been selected to question presidential candidates in 1991 and 2000. (At New Hampshire primary events, candidates are very accessible and usually still need to take lots of questions.)