Nine percent of Americans think they paid less in federal taxes this month because of President Bush’s tax cuts. But only a handful of them, one percent of the public, is a persuadable voter who is not yet firmly committed to either Bush or Senator John F. Kerry of Massachusetts in the presidential election, the University of Pennsylvania’s National Annenberg Election Survey shows. Every American who paid federal income taxes saw his or her rates reduced in 2003. But some made more money than in 2002 and paid more in taxes anyway. Moreover, some who actually paid less may have forgotten an advance check those with children received in 2003.