The man was later released without charge, after an investigation found that he had meant no threat to the president, Secret Service spokesman Edwin Donovan said.
Television pictures showed the paperback book sailing through the air close to Obama after the rally on Sunday, one of a series of events leading up to mid-term elections, though the president did not appear to notice it.
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The man, who was not named, was described by Donovan as an "over exuberant" supporter who wanted the president to read a copy of a book he had written.
