He's been so busy with his Senate work that he hasn't spent as much time with fundraising.

NPR: The 2008 Candidates and the Money Game

His campaigning work - which he fits in alongside a busy rock career that sees his band release their 14th album in November - has led to calls from several quarters for him to be considered for a Nobel Prize for humanitarianism.

BBC: NEWS | UK | Politics | 'Get real' on Africa, urges Bono

On Wednesday afternoon, he was busy putting the final touches to his collection of work which has never been shown to a European audience before.

BBC: Vicari 'icon' collection on show