  Motivated by the galactic positron excess seen by PAMELA and ATIC/PPB-BETS,
we propose that dark matter is a TeV-scale particle that annihilates into a
pseudoscalar "axion." The positron excess and the absence of an anti-proton or
gamma ray excess constrain the axion mass and branching ratios. In the simplest
realization, the axion is associated with a Peccei-Quinn symmetry, in which
case it has a mass around 360-800 MeV and decays into muons. We present a
simple and predictive supersymmetric model implementing this scenario, where
both the Higgsino and dark matter obtain masses from the same source of
TeV-scale spontaneous symmetry breaking.
