Be Like Mike. Bo Knows. We Must Protect This House. All were marketing campaigns that propelled their respective subjects from sports mainstays to transcendent cultural icons. With its' latest spot entitled "Training Day" Nike is once again trying to strike sports marketing gold. The ninety-second spot features none other than the king himself, LeBron James, as a mob of his fans follow him throughout the city of Miami while he undergoes his offseason workout regiment. It is eerily reminiscent of Sylvester Stallone's timeless Rocky scene, stopping just short of LBJ shadowboxing as a mob of children surround him while the…