David Cameron is Simon Cowell, George Osbourne is Cheryl Cole, but the big question is: who is the political equivalent of Louis Walsh? " CHERYL AND SI BATTLE OVER LOUIS ," thundered a Sun splash this week, exclusively informing the world that "X FACTOR'S AT WAR". Horrid news, and it goes without saying that none of us would wish to be at the sharp end of the offensive. But if The X Factor is at ...