Bill Clinton today accused the union backing Barack Obama of illegally blocking its workers from backing his wife in an orchestrated campaign of "voter suppression" in Nevada's Democratic caucuses. Mr Clinton, who spent 90 minutes at the Mirage Casino in Las Vegas today shaking voters' hands, was told by several workers that their union, which has backed Mr Obama, has told them they could not register to vote unless they supported the Illinois senator. Mr Obama was endorsed by the Culinary Workers' Union, the biggest and most powerful trade organisation in Nevada. It carries particular clout in the casinos along...