ABINGDON, ENGLAND - MARCH 29:  Liberal Democrat leader Nick Clegg speaks to activists as he launches the party's General Election 2015 campaign on March 29, 2015 in Abingdon, England. The Liberal Democratic party started it's election campaign in the Oxford West and Abingdon consituancy today where Mr Clegg unveiled the Liberal Democrat election battle bus and met with candidate for Oxford West and Abingdon Layla Moran.  (Photo by Dan Kitwood/Getty Images)