
I'm not saying you're wrong but I do think it's pretty unrealistic for most Democrats to genuinely prefer a Republican candidate at this time. The "vote blue no matter who" thing is mostly aimed at people who don't vote at all or vote third party because they don't like either option and can't handle voting for the lesser of two perceived evils (which would presumably be the Democrat)
There was very famously a party switch in this country BECAUSE their policies and ideologies changed. Party does not necessarily indicate policy. Trump claims to be a Republican, yet many of his policies are literally anything but. He’s been extremely pro-federal government and taking power away from states and he’s ballooned the national debt.