Food is about to become the next battle ground for, well, a whole menu of Washington favorites.  Sarah Palin has found a new way to channel the Tea Party movement’s anti-big-government fervor—and tweak First Lady Michelle Obama at the same time.  Starting with a classroom visit and a couple of dozen cookies, former vice presidential candidate Sarah Palin plunges into the national debate on the role of government and childhood obesity, as detailed in this Business Week article.