Republicans and Democrats are spending millions on negative ads in the battle over one of Tarrant County's state Senate seats.
But Brimer said Davis has put out "fabricated trash and lies."
Davis said Brimer has sued repeatedly to get her taken off the ballot.
Republicans and Democrats will spend a combined $2.1 million on the race. Democrats have deemed the seat one of two vulnerable Senate seats.
Brimer, a 20-year veteran of the Senate, said his seniority will help Tarrant County the most.
"It will do nothing but create more benefits for the county on transportation, on our environmental issues that we're fighting (and) on education," he said.
"He's not voting with his friends back here at home," Davis said. "I'm not sure he even remembers who his friends are back here at home."
"We have gone astray here in this state, and it's time that we have someone who's sitting in the state Senate seat who's going to be reflecting the concerns of our community," she said.
Brimer said his new ad is aimed at exposing Davis's "anti-senior" voting record on the City Council. The ad began airing Thursday.
"We've been at all-out campaign here, and that is the way we are going to finish it," he said. "We are going to beat her at the ballot box."
Pundits say it is unlikely Democrats will win control of the state Senate even if Davis wins, but they only need five seats to take back the House of Representatives.