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We report on a study of the decay B0bar -> D*+ omega pi-
with the BABAR detector at the PEP-II B-factory at the
Stanford Linear Accelerator Center.
Based on a sample of 232 million BBbar decays, we measure
the branching fraction BF(B0bar -> D*+ omega pi-) =
(2.88 +/- 0.21(stat.) +/- 0.31(syst.)) \times 10^{-3}.
We study the invariant mass spectrum of the
omega pi- system in this decay.
This spectrum is in good agreement with expectations
based on factorization and the measured spectrum in
tau- -> omega pi- nu_tau. We also measure the
polarization of the D^*+ as a
function of the omega pi- mass. In the mass region 1.1 to 1.9
GeV we measure the fraction of longitudinal polarization of
the D*+ to be
Gamma_L/Gamma = 0.654 +/- 0.042(stat.) +/- 0.016(syst.). This
is in agreement with the expectations from heavy-quark
effective theory and factorization assuming that the decay
proceeds as B0bar -> D*+ rho(1450), rho(1450) -> omega pi-.
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