Cuellar from the Democrats is the only one I care about.
And perhaps Debbie Wasserman Schultz too or the entire Florida D delegation.
It's a shame that Biden only won Cuellar's district by 4 points. We don't know how redistricting will affect it, but the RGV trends are worrying so if Cuellar isn't in a safe district sadly he's the better option to retain the seat than some progressive challenger.
Fair. At the same time, an anti-union Democrat is no better than a Republican.
That's an exaggeration and is actively harmful. A vote with you half the time is better than a vote with you none of the time, and even if all they do is have a D next to their name and allow Democratic leaders to decide what comes to the floor that is still better than a Republican. The Republican Party is so dangerous and extreme that it is silly to be picky about the alternative in a general election.
Of course, in a primary, as much as you can without helping Republicans, it is right to aim for someone that votes with you all the time.