"The photographer Ed Morris describes the bicycle as 'the perfect vehicle for traveling across the country,' and the mayor as the 'perfect vehicle for creating a collective portrait of the United States.' It%u2019s only natural, then, that he would put the two together. His new book, Mayors Across America, documents his 3,600-mile, coast-to-coast bicycle trip, during which he photographed the mayors of the cities through which he passed, and in so...