NEW ORLEANS (AP) — "Knuckleheads" are to blame for the shootings that wounded three people just after a parade organized to show unity and support for New Orleans' rebuilding, Mayor Ray Nagin said Monday at a Martin Luther King Day ceremony. In the face of the devastation still remaining, four months after Hurricane Katrina hit, people still came together to have a float-less "second-line" parade and have a good time, Nagin said. Framing his speech as a conversation in which he asked King's opinion about what has happened to New Orleans, Nagin said he told the slain civil rights leader:...