What is PADRAIG HARRINGTON thinking?

An interview is presented with professional golfer Padraig Harrington. Harrington says that the Muirfield golf course in Scotland, site of the 2013 British Open tournament, is a difficult but fair test for golfers. He credits his caddie Ronan Flood for his victory in the 2007 British Open. Harrington says he frequently changes his swing because of his belief that he can constantly improve as a golfer.