If it walks like a duck and talks like a duck . . . well, you know the saying. Today, if a candidate walks and talks like an obsessive Jew-hater, Democrats swoon. And in Maine, Graham Platner is making an entire political campaign out of his waddle and quack. First, we learned that the democratic socialist Platner, who’s competing with Gov. Janet Mills in the Democrats’ US Senate primary, had a large Nazi tattoo — an SS Totenkopf — emblazoned on his chest . When the revelation set off a public