Danny Davis is late and no one can find him. "It's going straight to voice mail," his scheduler says as she hangs up the phone after her latest attempt. This is not good news. A half dozen people have been waiting in his west-side congressional office for half an hour.Eventually a staffer arrives with word that the congressman has been seen--reportedly across the street at Wallace's Catfish Corner, the legendary soul food establishment named for proprietor Wallace Davis Jr.