Should Ryan Braun Give Back His MVP Award?

In light of the recent report that 2011 NL MVP Ryan Braun tested positive for a banned substance, should he have to give back his MVP award?  Should the Baseball Writers of America hold a re-vote and take the trophy away?

I am still a bit shocked that Braun possibly is dirty.  He certainly doesn't look the part.  However, the "I didn't know" excuse just won't fly in the court of public opinion.