This is not likely voters. Is it even Republican voters? Is TX an open primary?
Yes Texas is an open primary in that you don’t register to vote by party affiliation. When you go to the polls to vote on primary day you select which party you wish to vote in and are bound by that selection for any runoff election.
I posted a link to the data up thread which gives you the break outs of party IDs as stated by the respondents.
I think Texas is classified as a semi-cpen (or would semi-closed be the same thing?)primary state.
In Texas, you do not state your party-preference at voter-registration time - but you state which party primary you wish to vote in when you show up at the polling place on primary election day. (they work it so both partied agree to have primary election on the same date - I think they call it a unified primary date). The poll worker asks which party primary you are voting in (you can’t vote in both) and then they stamp your voter registration card and the list with which party primary you voted in and direct you to the ballots with that respective party’s candidates printed. Then, you can only vote in the runoff election of the party primary you voted in that day, which is held a couple of weeks later.
This is basically how you are considered to be a republican, democrat, or other voter in Texas. Actually getting more involved in a political party other than voting in that party’s primary and sending donations, is a whole other story.
But, this year I would bet a lot of people who normally vote in the Democrat Primary will vote in the Republican Primary because the Democrat presidential primary is uncontested. Also, Texas has an interesting republican primary race going on for retiring Senator Kay Baily Hutchison’s seat.