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PPP surveyed 750 usual South Carolina Republican primary voters from August 25th to 28th. The margin of error for the survey is +/-3.6%. 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.

I agree to not trust any polls. That is why I always read the methodology and sample. I can't find any issues here and it seems to be in line with other polling on the subject. If you also read through the questions, they are straight forward. I don't see were the bias is if they are promoting Perry for some reason.

“I agree to not trust any polls.”

Smart move. Sophistication of polling methodology has made polling more corrupt rather than more honest. Simply pick a sampling and word the question(s) in a way to give your client the result he wants. When a D+9 doesn't work, CBS and NBC resort to “weighting” until they get the desired results.