The state will send 261 delegates to the Democratic National Convention from July 13-16 in Milwaukee. With one of the largest delegations and a large Hispanic population, experts say Texas could play a large role in selecting the nominee.
District-level delegates:
The Texas Democratic Party allocates 149 district-level delegates among each of the 31 Texas Senate districts. The number of delegates each district receives is determined based on how the districts voted for the 2016 Democratic presidential nominee, Hillary Clinton, and the 2018 Democratic nominee for governor, Lupe Valdez. Once the primary ballots are cast in March, the district-level delegates are proportionally distributed in each district among every candidate who got more than 15% of the vote.
At-large and Pledged Elected Party Officials (PLEO):
There are 49 at-large and 30 PLEO Democratic delegates in Texas, who are allocated based on the statewide vote for the Democratic presidential candidates in March. Similarly to the district-level delegates, these delegates are all proportionally assigned to the candidates who received at least 15% of the statewide vote in March.
https://www.texastribune.org/2020/02/04/heres-how-texas-delegates-are-doled-out-presidential-primary/