Rochelle Thompson, 68, said she drove over to the office because her neighbor's Biden sign had been stolen. She described her neighborhood as "very Trumpy" and said that political discussions could be tense.
But Ms. Thompson also said she was seeing more Democrats publicly airing their views this year than they did in 2016.
"More people are being vocal because they're really sick of what's been happening the last four years," she said. "I'm thinking more people are going to vote Biden than they're saying."
A Monmouth poll of Pennsylvania from over the summer found that 57 percent of voters surveyed believed that there was a "secret" Trump vote after the president's unexpected victory in the state in 2016. But in Trump counties, 32 percent of voters also expressed a belief in a "secret" Biden vote.
In interviews, a number of Democrats in Westmoreland described being reluctant to make their views known in their communities, because they are greatly outnumbered and are reluctant to argue with neighbors, just as some conservatives in big cities or on some liberal college campuses tend to keep their views to themselves.
"We're biding our time till Election Day," Rich Seanor, 67, a Biden supporter who works at a liquor store, said as he finished a shopping trip at an Aldi grocery store in Greensburg. "Then we'll be loud."
About 10 miles away, in the Latrobe area, Republicans who had made the pilgrimage to a place called the Trump House felt no such reservations about speaking their minds. A mixture of Pennsylvanians and tourists from as far as Florida and Colorado milled around the yard and porch of a converted farmhouse painted to look like an American flag. The spot was designed to be a grass-roots, pro-Trump gathering place, said Leslie Rossi, the owner.
There, she distributes free Trump paraphernalia alongside voting information, and encourages people to change voter registrations and sign up as Republicans.
"Biden can't get 100 people a day at a rally," she said from the porch there, hours before Mr. Trump would announce his positive test for the coronavirus. "I get a thousand people a day."
"The polls are wrong," she added, "because of what I'm seeing here."