That poll is going to include ALL top GOP contenders, regardless of their intent to participate.
Romney and Bachmann, both will not actively participate in that poll. Not campaigning in that state this early. But will be on the list. And will take a bad hit with poor showing regardless.
Backmann could go from front runner in the Ames Poll, to dead last on the Florida straw poll due to her not canvasing the state and thus looking bad.