Democrat Aftyn Behn could win a special election in Tennessee—and Republicans are freaking out.

A Democrat is on the brink of winning a special election in Tennessee’s deep-red 7th congressional district—leading GOP Republicans and even Trump into a frantic last-minute attack.

An Emerson College Polling/The Hill survey released Wednesday has Democrat Aftyn Behn nearly tied with Republican Matt Van Epps, 46% to 48%—with 2% voting elsewhere and 5% undecided.

A victory here would continue an upward trend for Democrats on the local level, as Behn would be yet another Democrat to win on the state level this fall. Both Behn and Van Epps are vying to replace former Republican Representative Mark Green, who resigned from Congress in July.