  Dark matter might reside in a hidden sector which contains an unbroken
$U(1)'$ gauge interaction kinetically mixed with standard $U(1)_Y$. Mirror dark
matter provides a well motivated example of such a theory. We show that the
DAMA, CoGeNT and CRESST-II experiments can be simultaneously explained within
this hidden sector framework. An experiment in the Southern Hemisphere is
needed to test this explanation via a diurnal modulation signal.
