The WSJ absolutely lights up Newt Gingrich for his support of ethanol subsidies in an editorial called Professor Cornpone:
Some pandering is inevitable in presidential politics, but, befitting a college professor, Mr. Gingrich insists on portraying his low vote-buying as high "intellectual" policy. This doesn't bode well for his judgment as a president. Even Al Gore now admits that the only reason he supported ethanol in 2000 was to goose his presidential prospects, and the only difference now between Al and Newt is that Al admits he was wrong.
That's a deep cut. One likely to leave a mark on Gingrich's already slim prospects for getting the Republican nod in 2012.