Will America's Next War Be with Iran?

Iran is expanding its influence in Iraq, supporting Hamas and Hezbollah and threatening Israel's right to exist. This week, the President, Vice President and Secretaries of State and Defense have warned Iran to back off. At the same time the US is doubling its air and sea power in the Persian Gulf, a move one calls "gunboat diplomacy" aimed at Iran. What is the likelihood of a wider war in the Middle East? Would the President need the approval of Congress for strikes against Iran? If the US fails to attack Iran's nuclear installations, will Israel do the job? We hear from journalists, economists, political scientists and Middle East experts.