First Poll done by Alabama State is quite outdated from 3/1 show Santorum with a small lead:
However 2nd poll done from 3/1 through 3/6 by the Alabama Education Association shows Romney with a decent lead with Santorum and Gingrich tied for 2nd.
Conventional wisdom has been that Gingrich and Santorum would have advantage in AL, MS, and KS - but that conventional wisdom does not seem to take into account the inevitability momentum that is currently in Mitt's favor. While I'll be on the lookout for new polls, the primaries in AL and MS on this coming Tuesday should not be a given for either Santorum or Gingrich.
If Romney pulls upsets in one or two of these states, I think the race will effectively be over as those types of states provide most of the rationale for those two to stay in the race opposing Mitt.