At Dallas event, Democratic strategist Carville takes aim at Cornyn08:18 AM CDT on Wednesday, March 26, 2008By DAVE MICHAELS / The Dallas Morning News dmichaels@dallasnews.com James Carville came to Dallas on Tuesday and deployed his sharp wit against Texas Sen. John Cornyn, taking the aim off fellow Democrats who don't support Hillary Rodham Clinton in the strident presidential contest. Mr. Carville, a political strategist and Clinton confidant, hasn't backed away from his comparison of Bill Richardson, former Bill Clinton Cabinet secretary, to Judas for endorsing Barack Obama. At a forum at SMU, he mocked criticism of Democratic infighting, boosted Democratic...