GOP-aligned outside groups have spent roughly $8 million on TV spots this cycle in battleground districts, such as Rep. Anthony Brindisi’s central New York seat. The vast majority of those ads specifically hammer Democrats over impeachment.

Meanwhile, swing-district Democrats are receiving little reinforcement from their own party or even other liberal coalitions. Democratic and pro-impeachment groups have spent about $2.7 million in TV ads, according to an analysis of spending by the ad tracking firm Advertising Analytics. And more than $600,000 of that total went to ads targeting Republican incumbents, not helping vulnerable Democratic members.

“Many of us have been expressing our concerns to leadership,” said a Democratic lawmaker said, who declined to be named in order to speak candidly about strategy. “You don’t want to have to play catch up.”