Florida Democratic voters delivered another shock upset to the party establishment by nominating state Rep. Angie Nixon, a democratic socialist, over Alex Vindman, a moderate former national security professional who played a central role in President Donald Trump’s first impeachment.

Democrats have hoped to mount a comeback in the diverse, populous and economically dynamic state but have struggled to craft a message that resonates in the Sunshine State’s political climate. Nixon’s upset sets up a long-shot challenge to U.S. Sen. Ashley Moody, a former state attorney general selected by Gov. Ron DeSantis to fill the seat after Marco Rubio vacated it when Trump chose him as secretary of state.

The race has already inflamed tensions within the Democratic Party over how to energize liberal voters eager for unapologetic, combative candidates without alienating independents and moderates who have been key to winning in battleground states.

“If you’re surprised by tonight’s election results, you haven’t been paying enough attention to what’s happening in the South,” said Britney Whaley, the southeast regional director of the Working Families Party, which backs populist candidates. “Tonight’s election results must be a wake-up call to a political establishment that believes a populist message can’t win in the South. Angie’s campaign proves voters will respond to a bold economic vision that meets their basic needs.”