If people were open-minded, you would think that the more information they had, the more they would tend to come to agreement on issues. Surprisingly, political scientists and psychologists have found the opposite. More polarization exists among well-informed voters than among poorly informed voters. Moreover, when you give politically engaged voters on opposite sides an identical piece of new information, each side comes away believing more strongly in its original point of view. That phenomenon has been called “motivated reasoning.”
