Strangely, this does not fit my experience very well, which makes me wonder: How did they measure the degree of certainty? Since they only used three beliefs in the study, could this be a fluke? Might additional beliefs "wash-out" the difference? How well-presented was the correct information? From personal experience, I notice that facts that look like propaganda make me suspicious and conclude that if that's the best the opposition can come up with, I'm probably right.
Another interesting find was that the greater one's degree of education, the greater the effect. Did they fully disentangle this variable from the conservative-liberal variable, or am I to conclude that conservatives are more educated? This goes against what I have seen in other studies. I have heard that liberals are more school-smart and conservatives are more street-smart.
Another interesting find was that those with high self-esteem had a decreased effect and were more likely to accept correction. This makes me wonder: are we going about this the wrong way? Instead of angrily and arrogantly pushing our own version of the facts, perhaps we would better serve ourselves to build others up - and then tell them the facts. We all might be more persuasive if we toned things down. It's worth thinking about anyways.