Clinton's Pennsylvania Victory Exposes Vulnerabilities for Her and Obama

Clinton's win gives her momentum, but highlights the problems for both Democrats' campaigns.

Senator Hillary Clinton relaxes on her plane in Philadelphia before taking off for Washington, DC.

Senator Hillary Clinton relaxes on her plane in Philadelphia before taking off for Washington, DC.

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Now the campaign moves to nine more contests, including the Guam caucuses May 3 and the primaries in Indiana and North Carolina May 6. Obama was favored in all three contests, but that was before Clinton won Pennsylvania and gained some momentum.

If the two candidates amass delegates in roughly equal measure from now on, as is possible, the final decision may be made by about 800 superdelegates—Democratic leaders, elected officials, and activists whose decisions on whom to support are based on their own judgments and aren't linked to the outcome of the primaries and caucuses.