Check out this funny bit of press junket fun, now up at the Syfy news section
I think Arthur (Rory) had the best American accent; besides, he was the only one who knew that natl. stood for "national" and not "natal."
I think Arthur (Rory) had the best American accent; besides, he was the only one who knew that natl. stood for "national" and not "natal."

Matt Smith used the same voice for the American characters that he used in the video as he read the celebrity tweets. On the spot, that might be all that he can do. 