Feld Entertainment -- the producer of Ringling Brothers and Barnum & Bailey Circus -- is represented by lobbyist Timothy Dart, the brother of Cook County Sheriff Tom Dart. Timothy Dart, his wife, Jennifer, his law partner John Nicolay and their law firm, Nicolay & Dart, have contributed $13,100 to aldermen and their ward organizations since 2004, $4,000 of that to Finance Committee Chairman Edward M. Burke (14th), Illinois State Board of Elections records show.  ... "