LONDON, ENGLAND - OCTOBER 11: A book entitled 'Clegg or Cameron' sits on Deputy Prime Minister Nick Clegg's desk at The Cabinet Office on October 11, 2012 in London, England. Mr Clegg and Bono met in... more 

LONDON, ENGLAND - OCTOBER 11: A book entitled 'Clegg or Cameron' sits on Deputy Prime Minister Nick Clegg's desk at The Cabinet Office on October 11, 2012 in London, England. Mr Clegg and Bono met in the Deputy Prime Minister's office to discuss international development issues. (Photo by Peter Macdiarmid - WPA Pool/Getty Images) less