The volume of material needed to be cost effective will require biomass to keep a plant running full time at peak. Conservatives aren't going to like the most cost effective source of high oil biomass.
Considering how large the Buffett clan has entered into the "oil from biomass" market, and how they have kept it private, there seems to be a huge upside.
Granted, perhaps it would be more effective just to hold them captive and reprocess their feces, but that solution would lack a certain elegance, and besides, the taxpayer would be hung for the cost of their food in the interim.