Can Graham Platner beat the ‘true unicorn’ of American politics now that he’s the Dem nominee for Maine Senate?

The Republican Senate marketing campaign arm unleashes on Graham Platner in the hours after he formally clinched the Democratic Party’s nomination in the Maine Senate race. Dana Bash and the “Inside Politics” panel study what Platner’s win means for Sen. Susan Collins. Collins “is a true unicorn,” Ron Brownstein explains. “She wins more voters who disapprove of Trump than any other Republican in the country,” he says.