President Obama has been forced to cancel several debate practice sessions with Senator John F. Kerry, whom he tapped to play stand-in for Republican challenger Mitt Romney, leaving little time for them to spar ahead of next week’s first presidential debate. The Massachusetts senator has held at least one mock debate with Obama to help him prepare for the first matchup against the former Massachusetts governor to be held Oct. 3 in Denver, but several others were cancelled due to the the president’s busy schedule.
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