Interesting

"HOW TO KNOW WHO WON BEFORE THE NETWORKS TELL YOU: Watch Prince William and Loudoun counties in Virginia’s increasingly diverse D.C. exurbs. Old Dominion polls close at 7, and the Commonwealth tends to count pretty fast. Obama won both counties in 2008. Romney is a collar-county kind of guy, and he has to take back territory like that if he’s going to win. If they split, he’s in trouble. And if he loses Virginia, there’s no point worrying about Ohio. Tell me who won Prince William and Loudoun, and I’ll tell you whether we have President 45 or President 44, Part II.

http://www.politico.com/playbook/