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There is considerable psychological value in holding this view, because it reinforces the true believer’s conviction that his ideology is sound and just, and the reason his political beliefs have not triumphed is that dark and sinister forces oppose them. This mental mechanism is an escape hatch for unwelcome facts and evidence that would otherwise undermine the faith of the follower: Should his favorite candidate or conservative hero commit a serious gaffe or become enmeshed in a scandal, he can rationalize the negative information by saying to himself that it is all a plot by the media to make conservatives look bad. Sometimes Republican candidates rise in the estimation of Republican primary voters in the wake of a scandal, as we saw with Newt in South Carolina, because being attacked by the liberal media octopus is a sure sign that you are on the right side.
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Mike Lofgren (The Party Is Over: How Republicans Went Crazy, Democrats Became Useless, and the Middle Class Got Shafted)