Pennsylvania is set to be a decisive state in the 2024 election on Tuesday. Polls open at 7 a.m. ET in Pennsylvania, a “blue wall” state. This year, it’s the spot where Harris and Trump met for the first time at their sole debate in September in Philadelphia.

The most common disruptions at precincts are late openings, lack of staffing and voting machine issues, according to Jeff Greenburg, a 13-year election director veteran. He is now a senior advisor on election administration for The Committee of Seventy, a nonpartisan organization focusing on engagement and public policy advocacy.