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The obvious answer is better information and civic education. But this doesn’t work either. Moderately informed Republicans were more inclined than Republicans with the least information to believe that Bill Clinton oversaw an increase in the budget deficit (it declined massively). Why? Because, unlike the worst informed, they knew he was a Democrat. The tiny number of people with a very high level of political information tend to use it not to challenge their own opinions but to rationalise them. Political knowledge, Achen and Bartels argue, “enhances bias”. - www.theguardian.com