While Grover Norquist and his no-tax pledge may be losing support among congressional Republicans, a newer, more insidious group is getting greater attention. Americans for Prosperity, a Tea Party group relying on cash from the billionaire Koch brothers, announced a different pledge on Thursday. It s called the "No Climate Tax" pledge and it has been signed by House Speaker John Boehner, Majority Leader Eric Cantor, Majority Whip Kevin McCarthy and other GOP leaders.

The many ways that the Koch brothers make and spend money are a source of fascination for both the left and the right.