Thanks for the interesting breakdown on that race. Fortunately for Gerlach, Meehan and Fitzpatrick, that GOTV effort must have been largely confined to Phila. city and the NE.
Schwartz had the warchest in reserve ($3 million) to go all out on GOTV - she was hiring what I called smurfs (college grads in campaign t-shirts) by the busload and was even advertising on Craigslist for canvassers. She hit her Dem base hard in SE Montco and NE Philly. Also, Perzel went down in NE Philly, that took a lot of GOTV, and the Dems in Brady's and Fattah's districts probably were worked hard to come out for Sestak even though those are truly safe districts for Dems (Brady had no opponent, Fattah's was grossly underfunded).
Heck, GOP core voters got two robocalls on Monday for Schwartz from Bill Clinton. That is a GOTV full-court press to be calling the other party's primary voters. Money apparently was no object.