  The energies and transition rates to $J=1^{+} T=1$ and $J=2^{+} T=0,1$ states
in ^{12}C with matrix elements fitted to realistic $G$ matrix elements obtained
in non-relativistic approaches are studied. Then the effects of varying the
strengths of the two-body tensor and spin-orbit interactions are also
considered. The calculations are done in both a small space (0p) and a large
space (0p + $2\hbar\omega$). In the small space the B(M1) from ground to the
$J=1^{+} T=1$ is enhanced and gets closer to experiment if the strength of the
spin-orbit interaction is increased and/or if that of the tensor interaction is
made weaker. In a large space the spin B(M1) gets reduced by almost a factor of
two. A `self-weakening' mechanism for the tensor interaction which succeeded in
explaining anomalies in other nuclei does not seem to work for this case.
