The DNC only played ball with Fetterman after he won his primary against Conor Lamb, who was who they were initially backing. They're going to do the same with Platner against Collins, it's not like they really have a choice.

The DNC "swiftboating" him in his primary doesn't do anything but tell us he doesn't have connections with the DNC establishment, which could be good or bad. There is nothing in politics that lends credibility to a politician but their prior actions.