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From the Chicago Sun-Times:

Reportedly, Jay-Z, Mary J. Blige, Sean ''Diddy'' Combs, Susan Sarandon, Tim Robbins and Ben Affleck are among those advised to skip the Chicago festivities and focus on attending the expected Obama inauguration in January.

''There really only needs to be one star in Grant Park, and that's Barack,'' said the source, a high-profile elected official who spoke on the condition of anonymity, since he's not authorized to speak for the campaign on this issue.

''There will be plenty of time for a new President Obama to be surrounded by famous fans, all hopeful about a new administration.''