"The White House has been quick to shoot down the rumour, with Bush campaign spokesman Scott Stanzel claiming it was 'ridiculous'. But it could explain the peculiar performance of Mr Bush, who lost out badly in the first of three televised debates on October 1. The president stopped speaking several times in mid-sentence, as if he was waiting for someone to tell him what to say next. And he complained twice about being interrupted when no one had said a word."
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