EDIT: Patrick Murphy (yes, that one) has apparently endorsed Welder, which seems very un-Murphy-like. So have Jason Kander, Jamie Raskin, Mark Pocan, Bruce Braley and former KS Dems chair Lee Kinch. Weird establishment/progressive insurgent crossover support here.
It's almost as if the narrative of fight-to-the-death conflict between the Establishment and the Progressive wing is (and has been) massively overblown.
For the record, as someone who isn't particularly fond of candidates who willingly identify themselves as Berniecrats, I have no problem with AOC and Sanders stumping nationwide for Progressive candidates. I'm skeptical it will pay off in this district but it's in their strategic interest and I applaud them for it.