CINCINNATI/CHICAGO (Reuters) - He does it too often to be a slip of the tongue. When Republican presidential candidate Mitt Romney addresses his growing crowds, he always catches himself. "If I'm president - when, I'm president," Romney says in his speeches now, drawing cheers from the crowd. Polls suggest Democratic President Barack Obama retains a tenuous hold on the handful of states that will decide the race for the White House, but Romney is casting himself as the man with momentum, rolling toward an inevitable victory on November 6. ...

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