Dave McCormick, the Republican Senate candidate in Pennsylvania, has filed a lawsuit seeking to stop the counting of provisional ballots in Philadelphia, claiming potential invalidity. McCormick currently leads by over 36,000 votes against incumbent Democrat Bob Casey, who has yet to concede. The lawsuit requests the ability to challenge ballots in bulk, asserting irregularities in provisional ballot processes. Political analysts are skeptical about Casey's strategy to rely on outstanding ballots to close the gap. Counting of provisional ballots began on Nov. 8 amid calls for patience from state officials due to the close margin.