Associated Press: The ambitious Republican governors of Mississippi and Louisiana are a study in contrasts as an oil spill threatens coastal economies still reeling from Hurricane Katrina. Mississippi’s Haley Barbour, a well-connected former Washington lobbyist, has calmly said the oil slick looming offshore is just a sheen in most places and there’s no reason for people to panic. Louisiana’s Bobby Jindal, meanwhile, has questioned oil giant BP PLC’s response capability and the federal …