  We study how collider data and electroweak precision observables affect the
parameter space of models including a new dark force mediated by a massive U(1)
gauge boson. It acquires mass via a Higgs mechanism in the dark sector which is
connected to the Standard Model through kinetic mixing of the two U(1) gauge
bosons and the Higgs potential. We assess the impact of the 7 TeV LHC and show
that most of the parameter space of the model can be probed with an integrated
luminosity of 15 fb^-1.
