" So, is the Palin poll now "scientific"? Absolutely not. It is still subject to large scale efforts on the left and the right to mobilize people to vote. The poll has become something of a Rorschach test, a tiny political marker in a tightly contested race. Over the past two weeks, the results of the poll see-sawed back and forth from a majority saying "No" to a majority saying, "Yes". At the moment the single-voter system was implemented, it was close to a tie: 50% say Sarah Palin is qualified to serve as Vice President, and 48% say no. Those results, in my view, are actually a measure of the mobilization and manipulation efforts by partisans on both sides."
—PBS on Palin Poll