The GOP has added almost 198,000 registered voters to the books compared to this time four years ago, whereas Democrats have gained an extra 29,000. Though Democrats still outnumber Republicans by about 750,000 voters in the state, the GOP has seized on their uptick in party members as a sign that Trump is on track to win this critical Rust Belt swing state a second time.

“It’s one of the reasons why I am very bullish on Donald Trump’s prospects in Pennsylvania. I think he will win again, and I think he will win by more votes than he did in 2016,” said Charlie Gerow, a Harrisburg-based Republican strategist who has worked on presidential campaigns in the state. “Trump is doing what Ronald Reagan did 40 years ago, which is moving a lot of traditional Democrats into the Republican column.”

The GOP has also seen a larger boost in registrations than Democrats in three critical areas across Pennsylvania: Erie, Luzerne and Northampton counties, all of which helped Trump flip the state by backing him after supporting former President Barack Obama in 2012.