A new Zogby poll puts Herman Cain at the top of the Republican field, as the top choice of 28 percent of poll respondents.
Rounding out the top three are Rick Perry, who has tumbled by more than 20 percentage points over the past month among Republican presidential primary voters and is now second at 18 percent, and Mitt Romney at 17 percent. Fourth place goes to Ron Paul at 11 percent.
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