Did you read the article? Normally, I'd agree that the Democrats are the lesser evil, but these candidates are all as bad or worse than Republicans for trans people based on their own voting record and stated plans/policies.

The Iowa senate race has a Democrat who wants to remove all federal healthcare funding for trans people. From the article "The policy is more extreme than even some Republican policies in red states". Do you know how many trans people are only able to afford HRT because of Medicaid and the ACA? Do you know how many hospitals and clinics will start refusing to see trans people if that happens?

If these bigots win, it signals to party leadership and their "consultants" who dictate their policy that running on an anti-trans platform wins, and so then we'll have 2 parties whose official platforms are explicitly anti-trans.

I am lucky enough to not be in any of the places where these assholes are running, but if I were, I don't know if I'd be able to vote for a candidate who actively wants to harm me. I would still go vote for every other Democrat running, but I don't think I'd be able to vote for the blue Republican over the red Republican. Who would you vote to be thrown into a cage with, the hungry lion or the hungry tiger?