It is difficult to imagine a more unlikely pair of investors than House Speaker Nancy Pelosi and Texas oilman T. Boone Pickens. Pelosi, the San Francisco Democrat, is among the most liberal and pro-environmentalist politicians in Congress, while Pickens has long been associated with Republicans, hedge funds and the energy industry. Yet in May 2007, Pelosi invested between $100,001 and $250,000 to purchase public common stock in Pickens’ Clean Energy Fuels Corporation (CLNE). Pelosi's CLNE investment was first highlighted by Eric Odom on the #don'tgo blog. CLNE is a cog in Pickens’$6 billion plan to build a massive wind farm...