That's part of the problem. In some states there are basically only establishment dems on the ballot. The popular dems at the moment are AOC and Bernie who are from NYC (Bronx) and Vermont respectively. Both of those areas are solid blue.
I'm out on the west coast, another very blue area, and the vibe is to primary out a few dems who are bending the knee
Lindsey Graham has flip flopped on Ukraine with dizzying frequency since January 20