On the heels of the Fla straw poll comes this from Zogby.

Cain : 28%
Perry : 18%
Romney : 17%
http://zogby.com/news/2011/09/26/ibope-zogby-poll-perry-plummets-18-trails-cain-lead-among-gop-primary-voters/

These results are from an IBOPE Zogby interactive poll conducted Sept. 23-26 of all likely voters and of likely Republican primary voters.
...
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.

Looks like Cain is becomming the main beneficiary of Perry's awful inability to debate. The next one IIRC is scheduled for Oct 11. If this polling holds then Cain will get much more attention and we'll get a chance to see him as potential frontrunner fending off attacks from all sides.