Political action is the primary cause of ethanol use in the first place. It's a shame that of all the things we could have chosen to subsidize, we picked one of the least sustainable options. The farm lobby is again proving its strength -- at least in their support for the corporate farmer.
I haven't followed closely, but know that Texas has been unhappy with the ethanol mandates for various reasons, despite being one of the largest consumers. My first reaction was to think that they must have some sensible officials there. Of course, I then remembered where our oil companies are based - that and all the cattle producers. I believe their initial complaint was increased NOx emissions in non-fortified ethanol and now it mainly seems to be the increase in food prices.
http://www.governor.state.tx.us/divi...en20080425.pdf
I suppose that he's reached the "correct" conclusion is more important than the motive behind it.