Welcome to the college of converts, Mr. Vice President. "It is not a good policy to have these massive subsidies for first-generation ethanol," Al Gore told a gathering of clean energy financiers in Greece this week. The benefits of ethanol are "trivial," he added, but "It's hard once such a program is put in place to deal with the lobbies that keep it going."

No kidding, and Mr. Gore said he knows from experience: "One of the reasons I made that mistake is that I paid particular attention to the farmers in my home state of Tennessee, and I had a certain fondness for the farmers in the state of Iowa because I was about to run for President."

Mr. Gore's mea culpa underscores the degree to which ethanol has become a purely political machine: It serves no purpose other than re-electing incumbents and transferring wealth to farm states and ethanol producers. Nothing proves this better than the coincident trajectories of ethanol and Mr. Gore's career.