The Fate of Maine's Critical Senate Seat

Mark Halperin breaks down the political fallout surrounding Graham Platner, examining the Democrats' frenzied effort to replace him while holding onto the campaign success he built.... explaining why replacing Platner may be far more difficult than many expect. Mark also takes a closer look at the media's role in his rise and fall, plus Susan Collins' reelection hopes in one of the most contested races in the country.