Iraq, Iran and America's Credibility

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President Bush denies any intention to invade Iran, but foreign allies and adversaries--and many Republicans--are skeptical.  The administration is haunted by what some call the "Iraq syndrome." What will it take to restore America's credibility?   Plus, Hamas' resignation as the ruling party in the Palestinian Territories and, on Reporter's Notebook, why are Hungary and the Czech Republic better for children than the United States?