The price of gold prices found support at its key 200-day moving average Monday as the dollar strengthened ahead of the presidential election. Asset managers say gold investors should prepare to trade it differently depending on whether President Barack Obama or Mitt Romney wins Tuesday. Spot gold prices rose 0.52% Monday to $1,685.70 an ounce. SPDR Gold Shares (GLD), tracking a 10th of an ounce of bullion, rose 0.77% to 163.38 after gapping down