HARRISBURG, Pa. - Monday is the last day in Pennsylvania to register to vote in the Nov. 3 election in which the presidential battleground state is playing a central role in the contest between President Donald Trump and former Vice President Joe Biden.Voter registration in Pennsylvania has hit a record high in this cycle, and as of Friday, the latest statistics available, voter rolls were about 17,000 short of hitting 9 million.That includes nearly 4.2 million Democrats and nearly 3.5 million Republicans.Voter Guide 2020: Everything you need to know about voting in PennsylvaniaDemocrats continue to hold a substantial registration edge, but Republicans have narrowed the gap by about 200,000 from 2016′s presidential election to about 700,000.