  Spectropolarimetry of core collapse supernovae has shown that they are
asymmetric and often, but not universally, bi-polar. The Type IIb SN1993J and
similar events showed large scatter in the Stokes parameter plane.
Observational programs clearly have much more to teach us about the complexity
of asymmetric supernovae and the physics involved in the asymmetry. Jet-induced
supernova models give a typical jet/torus structure that is reminiscent of some
objects like the Crab nebula, SN1987A and perhaps Cas A. Jets, in turn, may
arise from the intrinsic rotation and magnetic fields that are expected to
accompany core collapse. We summarize the potential importance of the
magneto-rotational instability for the core collapse problem and sketch some of
the effects that large magnetic fields, ~10^{15} G, may have on the physics of
the supernova explosion. Open issues in the problem of multi-dimensional
magnetic core collapse are summarized and a critique is given of some recent
MHD collapse calculations.
