  We present a renormalization-group (RG) analysis of dark matter interactions
with the standard model, where dark matter is allowed to be a component of an
electroweak multiplet, and has a mass at or below the electroweak scale. We
consider, in addition to the gauge interactions, the complete set of effective
operators for dark matter interactions with the standard model above the weak
scale, up to and including mass dimension six. We calculate the RG evolution of
these operators from the high scale Lambda down to the weak scale, and perform
the matching to the tower of effective theories below the weak scale. We also
summarize the RG evolution below the weak scale and the matching to the
nonrelativistic nuclear interactions. We present several numerical examples and
show that in certain cases the dark matter - nucleus scattering rate can change
by orders of magnitude when the electroweak running is included.
