20/20: State of the Union

ABC News conducts two experiments examining the State of the Union. In the first, Cass Sunstein, a University of Chicago law professor, demonstrates that like-minded people are pushed to more and more extreme positions when they group together. It has profound and troubling implications for the country. In the second experiment, University of Pennsylvania Professor Diana Mutz demonstrates the impact of so-called shout TV, which is the media manifestation of the big sort. She shows that viewers are very likely to misunderstand those who disagree with them when they watch people shouting at each other.