There looks to be a touch of irony at the ceremony marking the 50th anniversary of Democratic Arkansas Gov. Orville Faubus's refusal to let blacks into Little Rock's Central High School and Republican President Dwight Eisenhower's effort to force him. Organizers say the September 25 event is becoming a major draw for Democratic presidential candidates. While virtually every pol has been invited, President Bush hasn't responded, but Sens. Hillary Clinton and Barack Obama are expected to go, as is former Republican Gov. Mike Huckabee . Awaiting his invitation: John Edwards.