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Obama adviser David Axelrod explains the president's comments to Rolling Stone magazine.
(CNN) â€“ The senior strategist for President Barack Obama's re-election team said he's "not surprised" his campaign raised less money last month than Republican rival Mitt Romney.
David Axelrod attributed Romney's May haul of $77 million to the end of the Republican primary season, allowing the presumptive GOP nominee to shore up cash that was previously going to a crowded field of contenders.