The real problem is that Dem voters would follow Dems off a cliff if told to do so. Dem voters are much like muslims in that way.
Not all of them.
Since many voters previously Dem voted for Trump this last time your statement is blatantly false.
In the past I saw 7 suburban precincts flipped back and forth depending on the candidates and not the party. From 60% D to 80% R to 87% D to 90% R.
We write off Dem voters and lose when they are really independent voters. When the Dem activists assume Independent voters are Dem when they are really Independent, the Dems win.