'Pumped up' PM Cameron ditches suit to answer campaign critics

By William James LONDON (Reuters) - Prime Minister David Cameron sought on Monday to answer critics who say his bid to win a May 7 election has lacked passion by ditching his usual polished image and suit jacket to deliver a 'pumped-up' speech on the economy. Cameron's campaign to beat Labour Party leader Ed Miliband in Britain's closest election race since the 1970s has been tightly focused on trumpeting his party's economic credibility, but has so far failed to swing o