  We construct a model based on an extra gauge symmetry, SU(2)_X x U(1)_{B-L},
which can provide gauge bosons to serve as weakly-interacting massive particle
dark matter. The stability of the dark matter is naturally guaranteed by a
discrete Z_2 symmetry that is a subgroup of SU(2)_X. The dark matter interacts
with standard model fermions by exchanging gauge bosons which are linear
combinations of SU(2)_X x U(1)_{B-L} gauge bosons. With the appropriate choice
of representation for the new scalar multiplet whose vacuum expectation value
spontaneously breaks the SU(2)_X symmetry, the relation between the new gauge
boson masses can naturally lead to resonant pair annihilation of the dark
matter. After exploring the parameter space of the new gauge couplings subject
to constraints from collider data and the observed relic density, we use the
results to evaluate the cross section of the dark matter scattering off
nucleons and compare it with data from the latest direct detection experiments.
We find allowed parameter regions that can be probed by future direct searches
for dark matter and LHC searches for new particles.
