ATHENS, Greece - After his stunning victory in the Olympic 400 meters, Jeremy Wariner seemed as cool as he did cruising down the stretch in sunglasses, two earrings and a jingling necklace. Picking up where Michael Johnson left off, Wariner became the sixth straight American to win the Olympic 400 title, leading a U.S. sweep of the medals Monday. Wariner finished in 44.00 seconds - a personal best and the fastest time in the world this year. He was followed by silver medalist Otis Harris (44.16) and bronze medalist Derrick Brew (44.42). Asked whether he had ever had a bigger...