Understanding the Scope of White Supremacy Hate in the U.S.

The ongoing FBI investigation of this week's shooting at a Sikh temple in Oak Creek, Wisc. is examining gunman Michael Wade Page's ties to neo-Nazi and white supremacist groups. Judy Woodruff talks to Mark Pitcavage of the Anti-Defamation League and Pete Simi of University of Nebraska, Omaha about the rise of extremist groups.