FOR THE BRIEFEST OF MOMENTS in Shrub: The Short But Happy Political Life of George W. Bush (Random House), the authors allow that political expediency is not George W. Bush’s sole call to arms. Witness his aggressive pursuit of a school funding initiative. That moment aside, Fort Worth Star-Telegram columnist Molly Ivins and Texas Observer editor Lou Dubose argue that Candidate George’s vision of Governor George’s record of political service is, shall we say, kinder and gentler. A f’rinstance: The Candidate says the air in Texas is cleaner since he took office. Au contraire, say Molly and Lou: “Texas pollutes more than any other state or Canadian province.” George W. fans with high blood pressure should avoid this epistle from two of Texas’ hardest-throwing political lefties. by Mike Shea