This is a great description of the effects of group think (although a bit long). At about the 7 minute mark he goes into the impact of hearing a message over and over. Seems if we hear something enough times, we have a tendacy to believe it to be true.. It explains why how political campaigns and even news interviews can distort reality. More importantly, it is a warning to leaders to ensure dissent (one of four (4)conversations of the elusive high performing team) when ideas are being discussed. Watch it and reflect. Post comments on your own thoughts on group think.