The runoff contest for the 15th Congressional District in Texas was still too close to call as of Wednesday morning.

Progressive small-business owner Michelle Vallejo was up by 23 votes out of more than 12,000 over her primary opponent Ruben Ramirez, an Army veteran and the more centrist Democrat of the two candidates.

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“Though the race is too close to call, we are heartened by the clear path to victory,” Vallejo said in a statement early Wednesday.

While much of the national attention in regard to Texas primaries was focused on the too-close-to-call race over the state's 28th District between Henry Cuellar and Jessica Cisneros, the margins in the race for the 15th District came much closer than any other primary that pitted a liberal against a more centrist Democrat.

The Rio Grande Valley seat became open after Democratic Rep. Vicente Gonzalez decided to run in the state's 34th District, which is seen as a safer Democratic seat given Republicans view the 15th District as the most flippable in the November general election.

In the March primary, Ramirez held 28% of the vote, leading Vallejo by 8 percentage points at the time.

The race for the 15th District was largely seen as a contest between a centrist Democrat and Vallejo, a more progressive candidate who gained wide support from lawmakers and groups such as Sen. Elizabeth Warren (D-MA) and the Congressional Progressive Caucus.

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While more recent Federal Election Commission reports show Vallejo topped Ramirez in fundraising, the more centrist Democrat previously benefited significantly from a $429,000 donation given by the pro-Israel DMFI PAC, which has dolled out several donations against progressive Democratic candidates this election cycle.

The winning Democratic candidate will face off against Republican nominee Monica De La Cruz, who clinched the GOP nomination in March and has wide support from Republican lawmakers and former President Donald Trump.