  We propose to search for axion dark matter via the oscillating electric
dipole moments that axions induce in atoms and molecules. These moments are
produced through the intrinsic oscillating electric dipole moments of nucleons
and through the $P,T$-violating nucleon-nucleon interaction mediated by pion
exchange, both of which arise due to the axion-gluon coupling, and also
directly through the axion-electron interaction. Axion dark matter may also be
sought for through the spin-precession effects that axions produce by directly
coupling to fermion spins.
