Arizona might—might—be a swing state this year, thanks in part to activists like these. But they want to make sure I understand that their work is not testament to any positive feelings toward the Democratic candidate. President Obama represents “broken promises,” and Clinton would be “no change,” says Alejandra Gomez, who works for a group called People United for Justice.

The activists are telling people to register and vote for one reason: to oppose Donald Trump and the Phoenix area’s controversial anti-immigrant sheriff, Joe Arpaio. It is a wholly, avowedly negative campaign. Sometimes, as their canvassers go door-to-door, people will ask them whom to vote for, or whether they should vote at all. “We say, ‘You have to vote to stop Trump and Arpaio. There are other people on the ballot,’” says Viri Hernandez, who is 25 and undocumented, and directs a group called the Center for Neighborhood Leadership.

That Arizona could be in play this year is testament to the oddity of 2016. Clinton held narrow leads in a few polls taken in the state over the summer, though Trump has led in most polls, and his lead has grown locally as well as nationally in recent weeks. Still, one polling average puts his lead at just 2 percentage points—in a state Mitt Romney won by 10 in 2012.

“The numbers say it is a swing state, even though it shouldn’t be,” a Trump campaign official acknowledged to me, adding that the Republican’s team is monitoring it closely.