Plummer, a Houston dentist and Democratic politician who served on Houston City Council representing At-Large Position 4 from 2020 through 2025, made history as the first Muslim woman elected to the council.
Early results showed Plummer and Parker neck and neck, but Plummer ultimately won with 51.13% of the votes, over Parker’s 48.87%, according to Harris County election results.
Plummer’s victory positions her as Democrats’ nominee to replace outgoing Harris County Judge Lina Hidalgo in November and signals that Harris County Democratic voters may be shifting toward a newer generation of leadership.
The runoff became one of the most closely watched local races in Texas as it exposed growing ideological divisions within the Democratic Party between more moderate establishment figures and younger progressive candidates.
Parker entered the race with decades of political experience, including three terms as Houston mayor, and campaigned heavily on financial management, disaster preparedness and experience in government.
Plummer leaned into a more progressive message and argued Democrats needed leaders willing to take a more aggressive approach against Republican officials at both the state and federal level.
The result comes despite a University of Houston Hobby School poll released earlier this month that showed Parker leading Plummer by 18 percentage points among likely runoff voters.
In 2025, Plummer announced her campaign for Harris County judge. Under Texas “resign-to-run” rules, she resigned from her council seat while remaining in office until a successor was elected. Houston attorney Alejandra Salinas later won the special election to replace her.
Plummer will now face the winner of the Republican runoff, former Harris County Treasurer Orlando Sanchez, in the November general election.