It's not a matter of a candidate being a fan of their team. The guy is allegedly a big Red Sox fan. He's obviously faking it (and not doing it very well).
When hilary claimed to be a life-long Yankees fan, I wish someone had had the 'nads to ask her to name three Yankee players from the '60s.
A singer, whose name I've forgotten, did just that to algore. When he told her how big a fan of hers that he was, she asked him to name a song or two that she had done. He couldn't even name one. Busted!
That was pretty much my point -- that instead of faking all this stuff, he should just be up front about it. I think most people respect that more.