I'm a little bit of a broken record on this, but the issue is that people mistake *partisanship* (D vs R, and the extent to which you cheer for your "team") for *ideological* positioning (left vs right). Crockett wasn't particularly left-wing, but she was very *partisan*.
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I'd describe Graham Platner as left-wing but not particularly partisan, by contrast.
there's a world where in a ~decade Platner follows the the Fetterman path, will be kinda hilarious if it happens
Yes.
Establishment Dems are extremely partisan (Orange Man Bad), but often centrist or non-ideological/vague in their policy convictions. Team sport.
Progressives are aware of Trump's badness in a dismissively obvious way, and more concerned by the substance of the alternative.
Republicans have a built in advantage because the vast majority of right-wing leaders and voters are also partisan.
Platner isn't partisan because he has no loyalty to the Democratic Party. And that should give Democrats a lot of pause.
If this guy is trying to flip 100K Trump voters due to his "non-partisanship", moderate Dems should probably support Susan Collins.