Texas state Rep. Jasmine Crockett, a first-term lawmaker, won the Democratic nomination for a Dallas-area House seat over political veteran Jane Hope Hamilton.

The victory all but guarantees Crockett’s rise to Congress, as the Democratic nominee typically wins the seat in Texas’s 30th District. The two had previously faced off during the state’s primary election on March 1, when Crockett barely missed the majority threshold needed to clinch the nomination. That set up a runoff showdown on Tuesday against Hamilton, who, in the initial round of voting, finished more than 30 percentage points below Crockett.

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In the heavily Democratic Dallas-area 30th District, incumbent Rep. Eddie Bernice Johnson’s retirement attracted a crowded primary with 15 candidates from both parties. Although Hamilton was initially considered an early front-runner, Johnson offered a major boost to her opponent by endorsing Crockett.

Despite having a lower profile than Hamilton, Crockett had gained some recognition as a state representative after joining more than 60 other state Democrats who fled to Washington, D.C., over the summer to delay Republican voting legislation. State Democrats had been split between who to support in the race, with Crockett gaining the favor of the more progressive members of the state legislature.

Hamilton had attempted to use her 20-year political career as evidence she was more prepared to be elected to Congress, heating up the race in recent weeks and ramping up negative ads against her challenger.

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The primary race became one of the most-watched runoff elections in the state, as 30-year incumbent Johnson is the only representative to hold that seat since it was created.