The corn based bio-fuel industry is not too liberal on the political movement spectrum. A few environmentalists have been suckered into it but the smarter ones know it has near zero potential as an alternative fuel source and oppose it vehemently.
A lot of it was engineered by conservatives in the pocket of the ADM corporation and other large agribusiness concerns. 43% of ADM's profits are government subsidized but pumps federal money into the corn belt it creates (mostly unnecessary) jobs in places like Nebraska and Kansas. It kind of like welfare, but instead of getting money for doing no work you get money for doing nothing important.It's like if you went to the welfare office but they wouldn't give you your check until you moved a pile of cinderblocks up a staircase and down again or filled in all the white spaces of a marble notebook with a black ball-point pen.
Unfortunately the proud republican voters of the red state belt are proud to have those useless jobs and they proudly vote republican so ADM still had major control over congress.
It would probably cost the average taxpayer less for agribusiness subsidy employees to go on welfare since the companies don't skim off huge profits. Philosophically the American taxpayer is giving them welfare then paying extra so they have high self esteem.