Graham Platner, a military vet and oysterman from a small town in Maine, will run for U.S. Senate as a Democrat in an effort to oust Republican Susan Collins.

Platner, a Democrat who served as a Marine in Iraq and the Army in Afghanistan, says the "oligarchy is the enemy."

A U.S. military veteran and oyster farmer on Tuesday launched a bid to unseat Republican U.S. Senator Susan Collins in Maine, as his party fights an uphill battle to try to recapture control of the chamber in next year's midterm elections.