Not sure how to judge this: looks like Dems ran nobodies in the 2014 Senate primary; a LaRouche follower ended up 2nd in the Dem primary that year.
https://en.wikipedia.org/wiki/United_States_Senate_election_in_Texas,_2014#Democratic_primary
Not sure how to judge this:
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For what it’s worth in Texas. You don’t register by party.
Come election day you choose which parties primary you want
to vote in and are committed to that. Come the next cycle
you start the process over again. It’s been a few election
cycles since a democrat has won a statewide race. IMO it
won’t change this year.