Chris Miller nearly doubled his $3,500 stock investment in a renewable-energy firm in 2008. It was a perfectly legal bet, but he's no ordinary investor. Mr. Miller is the top energy-policy adviser to Nevada Democrat and Senate Majority Leader Harry Reid, who helped pass legislation that wound up benefiting the firm. http://online.wsj.com/article/SB10001424052748703431604575522434188603198.html