Graham Platner, the anti-establishment oyster farmer, will be the Democratic candidate in the Maine election challenge, which is shaping up to be one of the most important battles for control of the Senate next November. And the Democratic leadership, which in recent months had

Maine’s Republican-held Senate seat is one of three Senate contests rated as toss-ups this year.

Graham Platner is seeking to make a Democratic nomination for U.S. Senate official in advance of one of the most anticipated contests of the year.