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.

Graham Platner, 40, from the Hancock County town of Sullivan, announced Tuesday he is running as a Democrat for the chance to take on the Republican senator.

A largely unknown oysterman and military veteran, Graham Platner garnered widespread attention this week when he launched a U.S. Senate campaign to try to unseat long-time Republican U.S. Sen. Susan Collins.