Because Bachmann has to win Iowa or she’s done. Huck won Iowa last time and there are a great deal of his supporters here looking for a home. Rollins of course was the guy that got Huck that win.
This is Bachmann’s only card to play. The Huck bloc is far more monolithic than the Tea Party. She’s in a corner with one way out, and she had to make a deal with the Devil.
Why she is letting Rollins do interviews though is beyond me. She needs to reel him in on that one.