A midstream energy stock has been an income and growth machine for a GOP representative. Beat the market. That's the goal for most investors. However, achieving that goal is often easier said than done. It wasn't difficult for quite a few U.S. senators and representatives last year, though. Over 30 of them managed to beat the market, with some of them raking in gains more than four times greater than the S&P 500. Meet the ultrahigh-yield dividend stock that helped one member of Congress generate a 122% retu ...