Pennsylvania is the top prize among battleground states. Here's what to expect for the 2024 election.

Pennsylvania was a pivotal state in the 2020 presidential election, sealing Joe Biden's victory over Donald Trump after four days of vote counting. So it's no surprise the Keystone State is again front and center this election cycle, with both Vice President Kamala Harris and former President Donald Trump investing time and resources there ahead of Election Day.

In the past few weeks, the presidential candidates have been regulars in Pennsylvania, often joined on the campaign trail by celebrities and fellow politicians. They've made some memorable pit stops — from Harris snapping selfies at Famous 4th Street Deli to Trump donning an apron during a campaign event at a McDonald's in Bucks County, which Pennsylvania Gov. Josh Shapiro calls the "swingiest of all swing counties in the swingiest of all swing states." Trump also returned to Butler for a rally at the same fairgrounds where he survived an assassination attempt in July.

CBS News' Battleground Tracker shows an effectively tied race in Pennsylvania a week before Election Day. The state is part of the Democrats' "blue wall" along with Michigan and Wisconsin, considered crucial for the party's path to the White House.