Just like biodiesel can be made from any veg oil and even animal fats, ethanol can be made from any sugar/starch containing plant material. What ever you can use to make booze, you can use to make ethanol; corn, wheat, barley, potatoes, apples, grapes, cherries, sugar beets, switch grass, rye, wood pulp...and on and on... Some things are better than others, but they'll all ferment and produce ethanol. Not just corn. Corn happens to be one fairly good starch/sugar rich crops grown to excess year after year, so it's become the starch of choice at this time.

I vote to eliminate tobacco acres and replace them with ethanol and biodiesel crops. LOL!!! That will make me popular.