Collins may have won comfortably in the past, but I think things are different this year, and the anti-Trump mood is even stronger than it was in Trump's last midterm election in 2018. Having said that, I tend to agree that Platner can beat her, and perhaps by a comfortable margin, but that Mills would be 50/50 at best and likely would lose to Collins. People in both parties clearly seem to be favoring anti-establishment outsiders, which Platner certainly is, while Mills will be easily portrayed by Republicans as just another aging, bland, establishment-backed Democrat who will bring more of the same 'ol, same 'ol to DC politics- she seems like the Cheri Beasley of Maine Democratic politics. A nice lady but boring and a status quo candidate in a definitely anti-status quo time. Maybe that's not fair, but that's how MAGAs will message it and they're very good at that sort of thing.