  A $SU(2)_D \times U(1)_D$ gauge-Higgs sector, an exact dark copy of the
Standard Model (SM) one, is proposed. It is demonstrated that the dark gauge
bosons ${\cal W}^{(p,m)}$, in analogous to the SM $W^\pm$, can fulfill the role
as a self-interacting vector dark matter candidate, solving the core versus
cusp and missing satellites problems faced by the conventional paradigm of
collisionless weakly interacting massive particle. Constraints from collider,
astroparticle and cosmology on such a self-interacting vector dark matter
candidate are scrutinized. Implications for the future searches of ${\cal
W}^{(p,m)}$ in direct detection experiments are discussed.
