UKIP tries to boost flagging support with image shift

By Andrew Osborn LONDON (Reuters) - Britain's anti-EU UK Independence Party (UKIP) sought to boost flagging support ahead of an election in three weeks' time by softening it rhetoric on immigration, showcasing a possible future leader, and ranging beyond its core policies on Wednesday. Though unlikely to win many seats, UKIP matters in what is shaping up to be Britain's closest election since the 1970s because it siphons support from Prime Minister David Cameron's Conservativ