Maine Democratic Senate candidate Graham Platner is increasingly confident that he will defeat Gov. Janet Mills in the June primary.Platner has a 22% average lead in primary surveys, according to RealClearPolling, despite the early days of his campaign being marred by scandal over a now-covered Nazi symbol tattoo and several resurfaced Reddit posts from the early 2010s in which he made demeaning comments about women and proclaimed that he “becam…