MORRISVILLE, Pa.-Allegations of absentee ballot fraud are marring the final days of a competitive congressional rematch here, raising the possibility that the outcome in this suburban Philadelphia seat might be decided in a courtroom after Election Day. The accusations coming from both Democrats and Republicans in Pennsylvania's 8th District have come to define the closing days of the contest between Democratic Rep. Patrick Murphy and former congressman he defeated in 2006, Republican Mike Fizpatrick. Both camps say the other is guilty of wrongdoing tantamount to stealing an election. For the moment, 8,000 absentee ballots have been sequestered in a Bucks...