The Southern Baptist minister, bass player, and two-term governor is the other green guy from Hope, Arkansas.

An "evangelical environmentalist," Huckabee promotes what he calls humanity's moral obligation to protect creation, backing up the spiritual stuff with support for energy independence, a mandatory cap-and-trade system to reduce global warming, and a requirement that 15 percent of U.S. energy come from renewable sources by 2020.

Upside | Huckabee could bring greens of various faiths together with his thumpin' bass line to "Mustang Sally."

Downside | His idea of alternative energy includes nuclear and "clean coal."