Personally I think the President should always throw the throw out the first pitch of opening day for DC's team. DC has had a long tradition of Presidents throwing out the first pitch (see below)
GW has a pretty good arm (also see below) and wouldn't mind seeing him throw out the pitch during his last year as president.
Who would you like to see throw out the first ball in DC's New Stadium?
(and please don't say someone stupid like britney spears or flava flaaaav )
W for St. Louis
@ a Nats game (thanks to jofizz)
President Wilson. Senators Game 1916
President Taft, Senators Game. 1911 (i think)
cooler than cool, silent calvin coolidge 1925
Nixon, probably the reason why they moved to texas lol