Across Iowa over the past three days, Obama talked about wind power and drought relief and middle-class taxes. But what he really seemed excited about was beer. He bought a round of beers at the fair. He told coffee shop patrons about one of the latest features at the White House: a home brewery. He spoke longingly of the beer he planned to quaff on the bus at the end of the day.By way of contrast, Mitt Romney is teetotal.