JTA — Oklahoma grassroots activist N’kiyla Jasmine Thomas is facing off on Tuesday against centrist Jim Priest in a Democratic Senate race that has become the latest litmus test for progressive politics in a conservative stronghold.

The two candidates are battling at the ballot box for the second time this summer after neither of them secured the needed majority to win the June primary contest. Thomas, a nurse who has been vocal against AIPAC, earned 45 percent of the vote in the June five-person matchup, while Priest, a lawyer and ordained minister, accrued 24%.

Both Thomas and Priest would be underdogs in the general election against Republican candidate Rep. Kevin Hern, who swept his primary and clinched the endorsement of US President Donald Trump. Oklahoma hasn’t sent a Democrat to the Senate in more than three decades.

Nonetheless, Tuesday’s runoff will serve as a referendum on the potency of progressivism in a deep-red state, just a week after democratic socialist Angie Nixon knocked out her moderate opponent in Florida’s Democratic Senate primary.

Unlike Nixon, Thomas is not a member of the Democratic Socialists of America. She has, however, openly identified with socialist policies, while her opponent, Priest, calls himself a moderate.