Hang on, I am looking at the actual results linked, and CNN is not representing the results correctly. Newt didn’t come in 2nd with 19%, in the most recent poll, he came in third with 15%, Palin came in 2nd with 18% (Romney still leading with 21%)
Page 2 here.
http://i2.cdn.turner.com/cnn/2010/images/08/13/rel11d.pdf
I think the data you cite includes all republicans while the statement about Palin coming in third was among those who identified themsleves as TP members or supporters.