Levi Tillemann, a tech entrepreneur and Obama administration alum, made official his run for Colorado’s 6th Congressional District on Sunday, challenging incumbent Republican Mike Coffman and a list of fellow Democrats for the coveted seat.

“Too many Democrats have become too soft,” Tillemann said in formally announcing his campaign, lambasting President Donald Trump. “They’ve become too gentle. They have forgotten how to fight. And we need to fight.”

In a June interview with The Denver Post, Tillemann said his campaign will focus on smart policies that will improve the lives of Coloradans, whether it’s making sure people can earn a living wage and afford health care, or stopping polluters from “wrecking the planet.”

He’s already been labeled as something of an anti-establishment candidate in the Democratic primary.

Democrats have long eyed Coffman’s seat in the 6th District. Registered Democrats outnumber Republicans in the district, and both Hillary Clinton and Barack Obama won there.

But in practice, the Republican Coffman has proven to have wide crossover appeal with both Democrats and independents, shrugging off consecutive, well-funded challenges by former state Senate President Morgan Carroll and former state House Speaker Andrew Romanoff by about 9 percentage points each.

The Democratic field of challengers is already growing crowded. Tillemann joins Aurora attorney David Aarestad, Denver attorney Jason Crow and Gabriel McArthur, who was a Bernie Sanders delegate.