Nick Clegg’s Christmas Card is the only political leader’s one that is Christmassy. The seasonal collage featuring Father Christmas and a snowman is by 8-year-old Caitlin Costello, who won a competition to feature on the LibDem leader’s card.  Both Ed Miliband’s card and David Cameron’s card are deficient in Christmas aspects. So it is good to see Clegg taking a more conservative line…