In central Florida, U.S. Army veteran Cory Mills has run ads about his company selling tear gas that was used to quell riots in 2020. “You may have seen some of our work,” he says, introducing a montage of what are labeled “antifa,” “radical left” and “Black Lives Matter” protesters running from the gas.

In northwest Ohio, a campaign video for Republican congressional nominee J.R. Majewski shows him walking through a dilapidated factory, holding a semiautomatic weapon, warning that Democrats will “destroy our economy” with purposefully bad policies…

Rick Shaftan, a conservative strategist working with Republican challengers this cycle, said that the party’s voters were nervously watching crime rates in the cities, asking whether public safety was being degraded on purpose. He also pointed to government responses to the pandemic as a reason that those voters, and their candidates, were nervous.

“People paid a lot of attention to the truckers,” said Shaftan, referring to Canadian protests against vaccine mandates that occupied Ottawa this year and briefly shut down an international bridge. “Canada’s supposed to be a democracy. … People worry: Can that happen here?”