Thanks, that’s where I was assuming. Like I want to believe, given the population spread throughout the state it seems reasonable to think there should be more left-leaning voters. But take for example this blurb from that site:

Texas voters do not register by party. However, when those voters participate in a partisan primary, that ballot choice is recorded and reported on the state voter file. In the absence of stronger indications (e.g. partisan political contributions or identification due to the holding of partisan public office) the most recent even-year partisan primary ballot is used .

But the 2024 primary turnout were 1.8M Republican ballots and 831k Democratic ballots. And that’s actually up vs the 725k Democratic primary ballots in 2020 (vs ~1.9M Republic ballots that year)! So that doesn’t add up.

We do know that there are otherwise-Democratic voters who vote in the Republican primaries because the districts are gerrymandered such that the primary is basically the real election (looking at me here).

This information is supplemented through the use of modeling analytics. Likely race in major urban areas plays a major role in that modeling.

I wish they would give more info than this.