Dianne Feinstein to Reintroduce Expired Assault Weapons Ban

Sen. Dianne Feinstein, D-Calif, has pledged to revive a law banning assault weapons at the opening of the next session of Congress. Gwen Ifill talks to Feinstein about the chances a new ban will pass after its 2004 expiration, and how it might eventually make weapons like those used in the Sandy Hook shooting less available.