Which senior politician's gaffes are newsworthy and which are not

Let's be generous and say that Chris Grayling is what, the fourth most senior Conservative politician - after David Cameron, William Hague and George Osborne - if so then the BBC are quite correct to report his remarks thus:

'A key Conservative has been recorded suggesting people who run bed and breakfasts in their homes should have the right to reject homosexual guests.

But shadow home secretary Chris Grayling said hotels should not be allowed to discriminate in that way.'

This story is the BBC lead political story and the number three story on the News front page.

Oddly, I can see no coverage on the BBC news website of Peter Mandelson - the number two, if not number one Labour politician, the man who has cemented his position at Gordon Brown's right hand by winning full control of Labour's general election campaign team - saying that if Labour wins the general election then Gordon Brown may not serve five years, or four or even three years as Prime Minister. Obviously news that the serving Prime Minister looking for re-election (sorry first election) as Prime Minister may not look to serve a full term is just not newsworthy in the eyes of the BBC, but why?