It’s been an exhausting year these last 12 days, but all the Canadian election night support puppies have scampered back across the border, and now is a good time to revisit former Boston pol Tip O’Neill’s admonition: All politics is local. Voters flipped the Palm Beach County Commission from a one-seat GOP majority to a one-seat Democratic majority. It’s a thin victory, though, and commissioners will operate in what has become a hot pink county.