In his Observer Diary Pendennis Column (Sunday 22 March 2009 ) Oliver Marre writes:
“A new 'ism' for Richard Dawkins. An excited source at pressure group Republic, which campaigns against the monarchy, says Dawkins is an official backer. Suggestions that he's cross because he's never been knighted are perhaps less pertinent than that he enjoys a fight.”
The story seems to be not that recent, going by an entry on the Republic Web Site, “Richard Dawkins backs Republic's campaign for end to monarchy”.
I am not really surprised. Dawkins often does give the impression of being “spoiling for a fight” rather than reasoned debate, though that goes for many, most(?), of the self-styled sceptic, limited classical science and materialist community in general.