The Sierra Club and Americans for Prosperity, the political action group funded by the Koch brothers, are both signatories on a letter to U.S. governors and legislators in support of the electric-car maker Tesla's efforts to be able to sell cars without enlisting independent franchised dealers. The public-interest groups’ letter, released today, argues that existing franchise laws shackle innovation. “Tesla’s market entry through direct distribution is providing consumers with beneficial new choices on what vehicles they buy and how they buy them,” the group said.