Residents line up outside the Montgomery County voter services office on Oct. 19, 2020, in Norristown, Pa. Last year, Joe Biden ran up the vote margins in Philadelphia’s four Collar Counties, which include Montgomery.

Residents line up outside the Montgomery County, Pa., Voter Services office, Monday, Oct. 19, 2020, in Norristown, 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. (AP Photo/Matt Slocum)