9/11 Commission: Americans can't be complacent about threats

A decade since the release of a major report on the nation's preparedness and response to the September 11th attacks, the original bipartisan commission reconvened to produce a new assessment of current threats and challenges. Tom Kean, former New Jersey governor and chair of the committee, and Lee Hamilton, vice-chair and a former Indiana congressman, sit down with Judy Woodruff.