Obama Concludes Africa Trip With Poignant Tribute to al-Qaida Bombing Victims

In Tanzania's capital, President Barack Obama was joined by former President George W. Bush in paying tribute to the victims of the 1998 al-Qaida bombing of the U.S. embassies in Tanzania and Kenya. Gwen Ifill reports on the final leg of the president's trip, including events focused on energy initiatives and fighting HIV/AIDS.