A potential boost for Bush and Republicans: "Gasoline prices are falling fast and could keep dropping for months... AAA foresees prices 10 cents a gallon lower by the end of next week. It reported a nationwide average of $2.84 Tuesday, the lowest since April 20. It's good news for consumers and the economy. Continued lower prices 'may act like a tax cut' and stimulate spending, says Richard DeKaser, chief economist at