For Democrats these days, the key word in their political vocabulary is “resistance.”

Amid the flurry of analysis and commentary marking President Donald Trump’s first 100 days in office, the Democratic Party’s position was clear: It is fighting the president and all he does, pure and simple.

“Yesterday, we marked Donald Trump’s hundredth day in office—and, much more importantly 100 days of resistance,” declared a weekend email message from party Chairman Tom Perez. That message used the word “resistance” three times.

For now, this position is an easy one for Democrats. Their party’s base burns with dislike of the president and anger that he won the White House despite losing the popular vote by almost three million in 2016. The demand from the party’s activists is simply to fight all things Trump.

But is that posture, along with a move to the left on cultural issues, the right long-term formula to claw back would-be Democratic voters lost in 2016? Some in the party aren’t so sure.