During his 2012 State of the Union address, President Obama said: “With only 2 percent of the world’s oil reserves, oil isn’t enough. This country needs an all-out, all-of-the-above strategy that develops every available source of American energy. A strategy that’s cleaner, cheaper, and full of new jobs.” Mitt Romney agrees: “An affordable reliable energy supply is fundamental to a prosperous and growing economy.” Biofuel can be an alternative energy source, but its benefits are contested. I...