The party's hopes of winning a Senate majority now rest on the progressive oysterman and military veteran. Oysterman Graham Platner won the Democratic Primary to challenge GOP Sen. Susan Collins in Maine, beating back a wave of controversies to get the party’s nod in a must-win race. Platner defeated Gov. Janet Mills and professor David Costello to win the nomination. His margin of victory ― he was earning 75% of the vote to Mills’ 19% when the race was called at 9:30 p.m. Eastern time ― would