State Del. Barbara Comstock was declared the winner in today’s “firehouse primary” conducted by the GOP to determine its challenger for the 10th U.S. Congressional District seat being vacated this fall by veteran U.S. Rep. Frank Wolf. The “firehouse primary” took place at 10 locations around the 10th district. Even as all the votes had not yet been tallied, the Washington Post declared Comstock the winner, and Comstock issued an email declaring herself the victor in the last mnutes. Comstock defeated three other candidates, most principally State Del. Bob Marshall of Prince William.

Comstock will square off against Fairfax County Supervisor John Foust, who secured the Democratic nomination in a 10th District Democratic convention today in Sterling. Both Comstock and Foust are from McLean.

The race will be one of the most watched in the U.S. this fall, as the seat was securely held by the GOP for decades with Wolf’s leadership, but now is considered a toss-up and chance for Democrats to add a seat in the U.S. House.