Chancellor Osborne aims to keep austerity on track as EU referendum nears

By William Schomberg LONDON (Reuters) - Chancellor George Osborne will try to get his austerity drive -- and his own political ambitions -- back on track on Wednesday, without upsetting voters before June's EU membership referendum. Osborne, who portrays himself as an unflinching guardian of the public finances, has slipped from the top of the list of contenders to be Britain's next prime minister, thanks to a slowing economy and some missteps on his part last year. Government plans to turn a bu