My source would be the Public Policy Poll that showed that Perry was in third place in Texas.
“PPP surveyed 559 Texas Republican primary voters from January 12th to 15th. The margin of error for the survey is +/-4.2%. This poll was not paid for or authorized by any campaign or political organization. PPP surveys are conducted through automated telephone interviews. PPP is a Democratic polling company, but polling expert Nate Silver of the New York Times found that its surveys in 2010 actually exhibited a slight bias toward Republican candidates.”
http://www.publicpolicypolling.com/pdf/2011/PPP_Release_TX_0117.pdf