DAVENPORT, Iowa - The White House press corps got off the bus. At a fairground here, the group followed a young woman in waxy red lipstick who held a sign that said, "Drop Gear Here." As law enforcement officers "swept" the "dirty" media types "clean" with mag wands, television reporters killed time by using the hindquarters of a giant plaster cow as the backdrop for their mock iPhone camera reports. A woman from the White House travel staff held a sign that said "Follow Me" while another yelled, "To the right! To the right! To the right!" The reporters trudged, cattlelike, to a media file center.