A resentment and distrust of academia, often held by people who didn't go to college, but still think of themselves as being intellectually superior to college professors, and of possessing an insight more in touch with "how things REALLY happened." This fits in well with the distrust for institutions and academic research, that the right-wing clings heavily to. To the right-wing, if a consensus of historians insist that Abraham Lincoln was a great president, then the exact opposite must be true.