It depends on which poll you look at. Perry had a bump for a while, but Cain is surging again after the debates this week. At one point Friday, he was getting 600 donations an hour.
Here is just a short list of polls with Cain much higher or winning:
http://www.zogby.com/news/2011/09/13/ibope-zogby-poll-perry-holds-big-lead-among-gop-voters-only-romney-leads-obama/
18 weeks at the top of Gallup positive intensity rating
http://www.gallup.com/poll/election.aspx
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2/26 Phoenix Tea Party Patriots
1st Place: 22%
3/20 Conservative Principles Conference
1st Place: 33%
5/5 Washington State GOP Straw Poll
1st Place: 15%
5/7 Wisconsin
1st Place: 26%
7/3 Cobb County GA
1st Place: 43%
7/8 Conservative Leadership Conference
1st Place: 24%
7/29 Smart Girl Politics Summit poll
2nd Place: 29% (Bachmann won)
7/30 Western Conservative Summit
1st Place: 48%
8/5 Ames Ranch (Oregon)
1st Place: 55%
Last week’s GA GOP Straw Poll
1st Place: 26%
9/3 Florida “Conservative Roar” Straw Poll
1st Place: 46%
The article mentions a Rasmussen poll so I went to find the most recent Rasmussen poll, which was Sept 23, the day before the article dateline.
Unless someone can show me a more recent Rasmussen poll before the article date, the author and the website are being dishonest in how they portrayed the rankings.