Well, they would get my vote if they changed their policies and behaviour. If you vote them no matter what they dont have to fight for it. (Note i am not a US citizen but the same principles apply. I have similar dissapointment with the formerly progressive parties in my country moving to the right)
And we can also observe this empirically with the current election. The Dems were so tone deaf that they thought to compete over Reps not too happy with Trump, fielding people like Dick fucking Cheney as their advocates. Meanwhile they lost a lot of votes they expected to just have secure because they expected the voters to be blindly loyal hence irrelevant to their strategy.
The same shit happens in systems with more than two parties. You also have the problem to think about rallying behind the main party on the left or right side vs. one that is closer to your ideals but probably wont become part of the government coalition. In Germany, where i am from, we had 12 out of 16 years under Merkel with a “big coalition” of the conservative CDU and the social democrat SPD. All that happened was the SPD moving more and more to the right. Now we had a coalition that was supposedly progressive but collapsed hard as well as the Green party and liberal party FDP also moving strongly to the right. We now in 2024 have policies among the supposed center/center-left that used to be fringe far right by German standards. This is why voting “tactically” or for “the lesser evil” fails. It gives a false sense of what is demanded by the people.
Also for the narrative control just take the win of Biden in 2020 as a counter example. Despite Trump holding office the Dems managed to win.