Cornyn takes on East Texas 10/04/2002 By TODD J. GILLMAN / The Dallas Morning News TEXARKANA, Texas - Governing is a team effort, John Cornyn tells voters, and he's not the guy who called President Bush's tax cuts "devastating" and "irresponsible." That would be his Senate rival, Ron Kirk, the former mayor of Dallas who Mr. Cornyn says is a big-city liberal "who just doesn't get it." "We're not running for mayor of Texas. ... Politics is a team sport, and I'm proud to be on the team that's led by our great president, George W. Bush," Mr. Cornyn...