The study seams to prove what most of us already suspected. Once peoples minds are made up they tend to ignore any facts to the contrary.
Some like to say they are not biased towards one party, and think they are immune to this faulty logic. I say bull. Based on their beliefs and ideals, almost everyone will tend to agree with one side more often than the other, even if they won't admit it. So I'd say this form of reasoning effects all of us to some degree. Especially listeners of talk radio.