That same day, she signed up to work at polling stations in the 2017 state elections, she said.

“I couldn’t sit at home anymore and bite my nails and watch Rachel and Anderson,” she said in an interview on Wednesday, referring to the cable news hosts Rachel Maddow of MSNBC and Anderson Cooper of CNN.

In January, when she is scheduled to be sworn in as a new member of the Loudoun County Board of Supervisors, Ms. Briskman will oversee that same Trump golf course — it is in her district.

“I don’t imagine there’s going to be very much coming across my desk relating to his golf course,” Ms. Briskman said. But, she added of the 800-acre property being in her district, “I take a little bit of enjoyment in that, of course.”

Ms. Briskman, 52, who ran as a Democrat, defeated the incumbent with just over 52 percent of the vote. She campaigned on updating the county’s environmental plan, adding affordable housing and increasing pay for teachers and firefighters. And while knocking on thousands of doors, only sometimes did she mention her famous single-digit gesture.