Jamaica's Usain Bolt is celebrating an OIympic milestone.  Bolt finished in 19.32 seconds to win the gold medal in the men's 200-meters for the second straight Olympics.  Combined with back-to-back wins in the 100-meters, he's the first man to win both the 100 and 200-meter sprints in consecutive Summer Games.  Jamaica's Yohan Blake finished in 19.44 seconds to win silver, while teammate Warren Weir won bronze with a time of 19.84.  American Wallace Spearmon finished fourth.