Energy mainly runs the U.S. Nuclear department, for the most part. And since as far as I know very few Republicans are advocating unilateral disarmament, then...
It's nice to know someone actually knows what some of these departments do. When Sarah Palin recently said she would be good at running the Department of Energy I was stunned into silence. Think about it. Sarah Palin running Los Alamos.
Yes, I saw that. Amusingly, when prodded further she explained that she wanted more federal land to be opened up to fossil fuel production ... Which is a fair position if you're that way inclined, but actually falls under the Interior Department's remit. D'oh!