One of former President Donald Trump’s final campaign rallies won’t happen in one of the seven must-win battleground states, but in deep-blue New York City. And one columnist is drawing parallels between that upcoming rally and a 1939 Nazi gathering. In a Saturday essay for the Guardian, Sidney Blumenthal — a former advisor to both Bill and Hillary Clinton — opined that Trump’s October 27 rally at Madison Square Garden will likely be his “most unsettling spectacle yet.” He further elaborated that the venue Trump chose for the event is the same location used by the Adolf Hitler-supporting Germa…