Former Interior Secretary Bruce Babbitt is throwing his weight behind Howard Dean, making Babbitt the first top environmental official from the Clinton administration to publicly back a candidate in this year's presidential campaign. Babbitt joined three prominent environmental activists and writers -- Paul Hawken, Terry Tempest Williams, and Bill McKibben -- in penning an impassioned endorsement of the former Vermont governor. Find out why Dean's their man -- only on the Grist Magazine website.