David McRaney tackles confirmation bias:
Punditry is a whole industry built on confirmation bias. Rush Limbaugh and Keith Olbermann, Glenn Beck and Arianna Huffington, Rachel Maddow and Ann Coulter these people provide fuel for beliefs, they pre-filter the world to match existing world-views. If their filter is like your filter, you love them. If it isn’t, you hate them. Whether or not pundits are telling the truth, or vetting their opinions, or thoroughly researching their topics is all beside the point. You watch them not for information, but for confirmation.