I think people are overestimating how much an effect individual candidates would have. Both candidates would have to have broad appeal to their respective parties to win the nomination. States like Colorado, Virginia, and Massachusetts aren't abandoning their partisan voting habits.
Baker 328 50% - AOC 210 48%
I agree about MA, but I think Virginia and Colorado mainly aren't swing states anymore because of the directions of the party. They attract a lot of young urban professionals who lean left but want to keep their way of life. We're not going to see them vote for someone to the left of Sanders based on partisan lean alone.