Cameron seeks to end party infighting, backs Osborne

By William James and Kylie MacLellan LONDON (Reuters) - British Prime Minister David Cameron backed his embattled Chancellor George Osborne on Monday in a bid to stem a bout of infighting triggered by the resignation of a senior minister. Cameron's Conservative Party, already divided over a forthcoming referendum on membership of the European Union, descended into chaos over the weekend after Work and Pensions Secretary Iain Duncan Smith resigned with a fierce critique of Osborne, a close ally o