The Constitution, Green, and Libertarian Parties of Pennsylvania are currently fighting the Pennsylvania unique petition-challenge system in federal court. Pennsylvania is the only state in which, if a group submits a petition and challengers claim the petition lacks enough valid signatures, the political party or independent groups are at risk of paying up to $110,000 in court costs if the petition does indeed lack enough valid signatures.

The parties filed in U.S. District Court last year and that Court ruled that the parties lack standing. The three parties then filed an appeal in April 2013. The appeal has been stalled while the Third Circuit was waiting to see if the Pennsylvania Republican Party would again intervene in the case, as the Republicans had intervened in the U.S. District Court. Even though the Third Circuit gave the Republican Party extra time to file a notice of appearance, the party has not done so, and the final deadline for the Republicans to do that has now passed.