close Graham Platner wins Democratic nomination for US Senate in Maine, AP projects Graham Platner speaks after winning Maine’s Democratic U.S. Senate primary at an election night party. NEW You can now listen to Fox News articles! Graham Platner , the populist Democratic Senate nominee in Maine, is in a virtual dead heat in a crucial Senate showdown with longtime Republican Sen. Susan Collins, according to a new poll. Platner, the embattled candidate who has been facing a slew of controversies,