Graham Platner has submitted his paperwork to formally withdraw from Maine's U.S. Senate race, officially ending an upstart yet troubled campaign whose dissolution threatens Democrats' pursuit of chamber control.

Maine Democratic Senate nominee Graham Platner on Friday formally ended his candidacy for the U.S. Senate, releasing the letter he submitted to the Maine Secretary of State to make his exit from the r...

"My name may have been on the ballot, but that ballot line belongs to the people of Maine," he wrote.