Across Pennsylvania — especially in rural communities — tens of thousands of yard signs supporting Joe Biden have popped up as his fans try to replicate how Donald Trump showed his growing support in the state in 2016. And, just as quickly, some of those signs have been vanishing.

It usually happens in the dark of night, local Democrats say, but sometimes in daylight. Sometimes entire streets or neighborhoods are cleared. Pro-Biden Facebook groups have devoted long threads to strategies for deterring sign snatchers — one suggestion involves clear hair gel and pesky glitter, another electrifying the metal frame with a car battery.

While sign thefts are a problem every election year for candidates of both parties — and are an ongoing source of headaches for campaign staffers and party officials — some Democrats in Pennsylvania and several other states insist it’s worse for them this year and illustrates the emotional intensity of the coming election. While there are examples of Trump signs also disappearing, there hasn’t been the same level of public outcry.