Fox News Poll of GOP primary voters finds Mass. Guv on top of preferred candidates.
Romney 21
Perry 13
Palin 8
Bachmann 7
Giuliani 7
Paul 6
Gingrich 6
Cain 5
Pawlenty 2
Santorum 2
Huntsman 2
Conducted Aug. 7-9, error margin 5.5 percent.
