John Alvarado, the chairman of the Texas Republican Party, said he had already committed to voting for the Texas nominee. “Every Texas delegate I’ve spoken to for months understands that. You don’t vote against your party’s nominee,” he said.
Voting records show the state Republican Party spent about $800,000 to field national candidates, candidates seeking to unseat Mr. Trump in his home state, and on party candidates nationwide.
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The party also spent about $400,000 to back Mr. Cruz in his home state of Texas, where he is the overwhelming front-runner.
The party spent nearly $6 million, though, on TV commercials, as well as $4 million on field mailers and another $500,000 on mailers directed at Hispanic and African-American voters, the data show.
Texas Republicans are also spending millions of dollars in national media and voter data to monitor Mr. Trump’s popularity. In a report this year, American Crossroads, the political super PAC backing Mr. Cruz’s campaign, said in December that the candidate was likely to win the state.
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The campaign did not respond to a request for the same information for Mr. Trump.
The Texas Republican Party’s spending on Mr. Trump indicates the extent to which his name has become ubiquitous, and his success, here. This is the state that, along with Florida and Ohio, led the nation last year in the number of registered Republicans under the age of 44, according to the Census Bureau.
Texas also became home to the fastest-growing electorate in the nation in 2013, with an influx of new voters. Since 2008, Texans have grown by about 22 percent, the fastest of any state, according to the Pew Research Center.
“Texas is a big red tent with a big white elephant in the middle,” said Patrick Schnarch