Newsarama has an interesting article on the rights and wrongs of comic book publishers (such as Marvel) putting out material involving a public figure (in this case, Barack Obama).
My question to Marvel would be why they permitted an sequence involving Gordon Brown to appear in Captain Britain and MI13 #1 (which generated a lot of positive coverage for him over here) and blocked a similar sequence in a future issue involving David Cameron.
Now I doubt that anyone at the publisher seriously favours one over the other (I would not presume anyone at Marvel knows anything about UK politics, why would they?) but this lack of equality in coverage essentially boils down to political interference over here. - especially given that it's added to Gordon Brown's personal delusion that he's some sort of superhero, "saving the world" he says, which is doing serious damage to the way he runs the country.