The continuing mission in Afghanistan

President Obama has repeatedly tried to explain the mission in Afghanistan, eight years after the September 11th attacks, as an attempt to destroy al-Qaida as a threat. Osama bin Laden and the location of the al-Qaida leadership is still believed to be somewhere in the rugged highlands of northwest Pakistan, not far from Afghanistan. Joining us is Ian Black, Middle East editor for The Guardian newspaper and longtime reporter, editor, author and analyst of Middle East issues and military affairs.