WASHINGTON — In the contest for president, Barack Obama is a magnetic candidate supported by a disciplined, well-organized campaign. John McCain seems wooden, with a campaign that appears to be in shambles. Yet Obama's lead in the polls over McCain is fragile because he so far has not won the support of a majority of American voters.

An effective and massively publicized foreign trip failed to push Obama to the 50 percent mark. Hopes of Democrats and fears of Republicans that he ...

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