The Cozy Relationship of Money and Power

The Christian Science Monitor has a story about a study done by "researchers from four universities" (no other details are provided) on the stock market performance of investments by US Senators. Would it be shocking to find out that they did well? Because they did, beating the pants off market indexes and even corporate insiders. The article comes short of accusing senators of out-and-out insider trading, but it contained a number of quotes to that effect ("Senators may be just smarter, but it seems really unrealistic"). Money and power, power and money...