Democrats pulled off a surprising upset on Tuesday evening by flipping a Georgia state House district that has historically leaned Republican.

Democrat Eric Gisler defeated Republican Mack “Dutch” Guest IV in the special election for Georgia’s House District 121.

President Trump won the district by 12 points in last year’s general election.

Eric Gisler, a tech executive and small business owner, took the lead in the Athens-area district with 50.85% of the vote, according to unofficial results from the Secretary of State’s office. Republican candidate Mack “Dutch” Guest IV received 49.15%, nearly 200 votes behind.

In metro Atlanta, two candidates vying for an open House seat are headed to a runoff after no one managed to clear the 50% threshold required to win a seat outright in a six-way contest. Republican Bill Fincher and Democrat Scott Sanders advanced to a January 6 runoff.

The two races are part of a series of off-year special elections for state legislative seats in Georgia to replace lawmakers who have died, resigned, or been appointed to other political offices.

In addition to the Georgia upset, Democrats celebrated a victory in Florida by winning the Miami mayor’s office for the first time in nearly 30 years.

“I think we had the right message for the time,” Gisler said in an interview. “A lot of what I would call traditional conservatives held their nose and voted Republican last year on the promise of low prices and whatever else they were selling,” he added.

The special election was held to replace Republican Marcus Wiedower, who resigned in the middle of his term to focus on business interests. The district spans most of Oconee County — a Republican suburb of Athens — and extends into heavily Democratic Athens-Clarke County.

Republicans remain firmly in control of the Georgia House, but their majority is likely to fall to 99-81 when lawmakers return in January. Additionally, voters in Atlanta’s northwest suburbs sent Republican Bill Fincher and Democrat Scott Sanders to a January 6 runoff for a seat created by the death of Representative Mandi Ballinger.

The GOP’s majority in the Georgia House has dropped from 119 Republicans in 2015. It would be the first time the party holds fewer than 100 seats in the lower chamber since 2005, when they won control for the first time since Reconstruction.