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The unseen threat of a Saddam with WMD was an argument that played to Bush's strengths. As a politician, Bush has always been better at asserting his case than at making it. After 9/11, his sheer certitude--and the faith Americans had in his essential trustworthiness--led Americans to overwhelmingly support him. The yellowcake affair may have already changed that relationship, for as the casualties mount in Iraq, polls suggest that some of that faith is eroding. Which means the next time Bush tells the nation where he wants to go, it may not be so quick to follow. --With reporting by Massimo Calabresi, Matthew Cooper and Adam Zagorin/Washington, John F. Dickerson with Bush in Africa, J.F.O. McAllister/London and Andrew Purvis/Vienna