Polo is the sport of playboys and kings. And — a man who spreads asphalt.  Glen Waterson is captain of an usual blue collar polo team.  His players include a construction worker, a school teacher, a black smith and a 12-year-old rookie.  They have penetrated the preserve of privilege and wealth, competing on a field that Waterson keeps in shape with a borrowed front loader.  This is probably as good a definition of Democracy as any.  After the games, the blue bloods and the good ol’ boys are the same.