Aye, to an extent though every British PM since Chruchill has had to big the yanks up for nuclear umbrella reasons if nothing else.
I personally reckon that the reason Cameron is plummeting in the polls isn't because of any one thing that he or Brown have done, more like the fact he's still playing Blair's game.
I think while the man at the top acted the way he did we'd all been conditioned to think that was the norm, and so Cameron fitted alongside him quite comfortably.
Now though, with the return of pin-stripe 'serious' politics with Brown, our expectations have shfted again, and Cameron just looks like a tit.