The political parties have concluded their respective four-day infomercials and the fall presidential race is on. Two New Yorkers earned their party nominations after brutally long and tough primary races and contentious, divided conventions, many of the opposing factions still stewing with hurt feelings over their final defeats. And while the right coalesces behind Donald Trump and the left gathers behind Hillary Clinton, a large number of Americans somewhere in the middle — those who see the world as more complex than the simple black-and-white answers offered in Cleveland and Philadelphia — fret over their choices.