Its just politics.

Susan Collins is a literal dragon, Platner has the best run on her. Keep in mind, the DNC varies in strength and organization. I think it shows Platner's campaign is willing to "play ball" in order to, however unlikely, make a good run at that senate seat. I'd say its more likely the DC consultant class that defines the national org (a class that is objectively on the back-foot, as the left is gaining nationally, albeit with mixed outcomes) thinks Platner is their best bet at an already extremely unlikely upset.

I think they have a read on him that would put him closer to Fetterman in the Senate. I think Platner is kind of dumb but upsetting Collins would be hilarious. And Platner has managed to get national attention, even pretty early on. I think he's just objectively the best odds in this race.

But I'm not to the point of even critically supporting him. I don't think he's earned a goddamn thing, being a highly problematic ex military pseudo anarchist or whatever doesnt make him qualified to lead our movements. But I think part of Platner's viability is because of a very weak bench in this race. Maine DNC clearly isn't creating or recruiting good leadership, which is a persistant problem in many political orgs.