According to this story in the Philadelphia Daily News, the Pennsylvania extension of the filing deadline for candidates running in the primary benefited ten delegate candidates (pledged to Hillary Clinton) who otherwise would have failed to get on the ballot. Pennsylvania requires a petition signed by 2,000 signatures for presidential candidates to appear on a presidential primary ballot. In addition, candidates for Delegate each need their own petition (within any particular U.S. House district) of 250 signatures.

Pennsylvania elects 103 delegates to the Democratic national convention. According to the story, 10 Clinton delegates would have failed to get on the ballot, except that on the filing deadline, Governor Ed Rendell extended that deadline another two days. He said the extension was due to bad weather. Thanks to Larry Otter for the link. Even given the extension, Clinton did not manage to file a full slate.