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By claiming that support for the war never went above 60%.
A Pew/CFR poll had support at 62% in October 2002.
http://www.cfr.org/publication.html?id=5051
In any case, presidents do not decide to go to war based on polls. As similar percentage (61%) of Americans supported Clinton's illegal war of choice on Kosovo. Should he have called it off since he did not have, say, 80% support?