Three Keys to a Democratic Victory in Maine

Editor’s Note: Welcome to The TNR Blue Book. It’s our new daily newsletter that covers Congress and much more, but with a distinctly TNR twist: Our focus will be strictly on Democrats, liberal and progressive groups, and the fight to take back power and save democracy. Every morning, you’ll get a rundown of late-breaking news, what Democrats on Capitol Hill are thinking, quick hits on what you need to know nationally, the latest on what’s coming out of the think tanks and activist groups, short…