US Presidential campaigns involving an incumbent usually boil down toa simple choice: the challenger's proposal for change against thesitting president's argument for more of the same. This year's race, however, reverses the terms of reference. George W. Bush, spurred and empowered by the terrorist attacks of September 11, 2001, has precipitated far more dramatic policy changes than could have been predicted from his narrow margin of victory in 2000. Voters this year must consider whether those changes should be consolidated and perhaps extended, as the president has advocated, or blunted and perhaps rolled back by the Democratic nominee, Senator John Kerry of Massachusetts.