Is the US Gearing Up for War with Iran?

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As President Bush sends more troops to Iraq, he's also doubling America's air and sea power in the Persian Gulf. Is it "gunboat diplomacy" against Iran?  What are the chances of a wider war in the Middle East? Plus, there's pressure on President Bush to take action on global warming, and Cuba's healthcare system has been called the envy of the world, but it's reported that a doctor from Spain has been called to treat Fidel Castro.