from what i read, i'd have to say carter. hoover was fiddling while rome burned. bush senior was really a spin fisherman, and i don't think he had much luck (i remember the papers even reporting that he was on his X day without a fish. and that was striper fishing in Maine during the season, where if you go more than two days without a fish somethings wrong).

as far as obama, i think he made the promise to go fly fishing in missoula when i was there (though he might have made that promise at every campaign stop) i don't know about catching fish, but he certainly is good at catching flies (did you see the interview?)