This poll was conducted after Perry’s most recent subpar debate performance last Thursday, but the survey was still in the field when Cain won a Florida straw poll on Sunday. Cain was the top choice of only 8% a month ago.

Michele Bachmann continues her drop in our polling, falling from a first-place 34% on June 30 to just 4% now. While some other announced GOP candidates have had large fluctuations in their standing with party voters, since June 21 Romney has remained steadily between 12% and 17%.