WASHINGTON -- A decade ago, the kind of turbulence that hit Governor George W. Bush's campaign last week might have threatened to knock a candidate out of the presidential race. For better or worse, President Bill Clinton has changed the rules.

Mr. Bush's high-flying campaign was brought to earth over the question of whether he has ever used illegal drugs, and even some supporters believe he will be hurt by the week's events. Whether the damage is serious or longlasting was not clear Friday, and the Texas governor quickly shifted back to his pie-turbulence posture of vowing not to answer questions on the issue.

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