  We prove that for the frame flow on a negatively curved, closed manifold of
odd dimension other than 7, and a Holder continuous potential that is constant
on fibers, there is a unique equilibrium measure. We prove a similar result for
automorphisms of the Heisenberg manifold fibering over the torus. Our methods
also give an alternate proof of Brin and Gromov's result on the ergodicity of
these frame flows.
