Listen hard to the people telling you what you don’t want to hear
Michelle Goldberg writes: Hopefully, by the time you read this, Graham Platner will have dropped out of the Senate race in Maine. If he hasn’t, he needs to, immediately. His campaign, which started with such excitement and inspired so many people in Maine, has become a shameful catastrophe. What’s left — besides finding a Democrat to run in his place — is figuring out what, if anything, can be learned from this debacle. As you probably know by now, Politico…