The presidential pen stroke that outlawed discrimination
Video duration: 3:59
Half a century ago, Lyndon B. Johnson signed landmark legislation outlawing discrimination based on race, ethnicity and sex. At a summit honoring this chapter of Johnsons legacy, President Obama applauded the Civil Rights Act of 1964 for opening doors of opportunity for himself and other Americans, while former Presidents Clinton and Carter cautioned that challenges remain. Gwen Ifill reports.