Let's face it, that's the dilemma I have with Democrat voters. They absolutely don't pick anything they just mindlessly vote for the party guy (or gal) whoever that is. The would-be President in absentia responsible for a life-destroying crime bill that ruined the lives of countless African-American families, or it's willing enforcer Kamala Harris. Peas-in-a-pod examples of the systematic injustice that the left is always on about.
If I were a leftist myself I'd vote for neither of these guys as they're totally incompatible with progressive values, and no "just beating Trump" isn't valid here. Neither of these people is capable of beating Trump, IMHO, ever. Not because Trump is especially wonderful, but that they carry all the weight of your average Ponzi-scheme purveyor. Trump, in comparison, is nearly unchanging and just the same neo-con type guy he's been since whatever. Agreeable or not, he's consistent, but the Dem leadership thinks they can just jump around and switch their ideology on a dime. That's just not how it works folks...