Lib Dem officially starts the day celebrating the pledge at Buckingham Palace . Later hits the pledge banner at a hedgehog sanctuary in Solihull . Nick ##hes insists his ' plucky party ' can defy the pledge on May Day .
Lib Dem leader starts the day meeting the Queen at Buckingham Palace . Later hits the campaign trail at a hedgehog sanctuary in Solihull . Nick Clegg insists his 'plucky party ' can defy the polls on May 7 .