You got a link to that poll? The only poll that I've seen so far showed Newt in first place for Alabama that was published on Feb 24th.
The pollster likely started polling in mid Feb the low point in the Gingrich campaign. However, despite that, Gingrich still led in Alabama, which makes it highly likely that Gingrich still leads in Alabama now.
I think he’s following this polling — by Alabama Ed Assoc and Alabama State.