Tommie Smith is selling the gold medal he won at the 1968 Olympics in Mexico City, where his Black Power salute on the podium shocked the sports world. The former San Jose State runner has put his gold medal for the 200 meters and red-and-white Puma spikes up for auction at New York-based M.I.T. Memorabilia. The bidding starts at $250,000, and the sale is scheduled to close Nov. 4. M.I.T.'s Gary Zimet said Smith is selling the medal for the money but also because he wants to share it with the public. ..Smith, now 66 and living in Georgia declined...