PRESIDENT BUSH HAS TAPPED A FLORIDIAN TO REPLACE MICHAEL BROWN AS HEAD OF THE FEDERAL EMERGENCY MANAGMENT AGENCY. R. DAVID PAULISON IS A CAREER FIREFIGHTER FROM MIAMI. PAULISON'S NOMINATION COMES AFTER MICHAEL BROWN STEPPED DOWN MONDAY. LAWMAKERS CRITICIZED BROWN FOR HOW HIS AGENCY RESPONDED TO HURRICANE KATRINA. CHAD PERGRAM REPORTS FROM CAPITOL HILL. (AUDIO)