Saying “the Democrats” did this or that either means federal elected officials or the registered voters of the party. In your examples, you’ve got two strong cases for the former. I disagree that all federally elected Democratic officials support this. I disagree that most do, but I don’t have any proof for either.

not one person has offered up a single example of a verifiable voter who claims to have voted a straight Democratic ticket, except for Trump at the top.

I agree with that. Because statistics is the devil’s flatulence there might be one, but no one has even claimed such an example.