It was once almost a taboo at the festival, but just about every performer this year, from the SNP's Alex Salmond to an Irish wizard creating a kids' utopia, wants to talk politics. But when the real world is so extreme, is it all beyond a joke? You can't move for politics in Edinburgh. Whether it's a practical guide to democracy for kids, or a big-name politician with more time on his hands than he would have wished…
