A stock rarely traded by United States politicians is experiencing massive short-term gains after a Congress member made a bet on the company.Following months of trading inactivity, Representative Debbie Wasserman Schultz from Florida purchased shares in Hecla Mining Company (NYSE: HL), a gold and silver mining firm.Since the August 9 transaction, HL has rallied by 29%. At the time of the trade, the stock was valued at $5.04 and closed at$6.51 on September 12. HL six-months stock price chart. Source: Finbo ...