Maine Democrats' Expensive US Senate Primary Heats Up.

It's the battle of the year in Maine, folks, and it's not just about who's going to take down Sen. Susan Collins - it's about who's going to get the Democratic nomination, and let's just say it's getting ugly. Graham Platner, a combat veteran turned oyster farmer, is taking on Democratic Gov. Janet Mills in a primary that's shaping up to be one for the ages. But before we dive in, let's just say that things are about to get very, very interesting.