Anyone who has been out in the real world during current and previous Christmas shopping seasons knows that there has been an informal (and occasionally formal) proscription against stores wishing customers a "Merry Christmas" and promoting Christmas in their ads and promotions. On Friday, Wolf Blitzer's CNN panel tried to pretend that the hostility towards "Merry Christmas" has never existed, as they mocked a video which exaggerated its thanks to President Donald Trump for "allowing us to say merry Christmas." Trump has made his preference for "Merry Christmas" very clear. The Trumps' 2017 Christmas card, as would be expected, has a...