By Lawrence Hurley and Andrew Chung WASHINGTON (Reuters) -The U.S. Supreme Court on Friday took the dramatic step of overturning the landmark 1973 Roe v. Wade ruling that recognized a woman’s constitutional right to an abortion and legalized it nationwide, handing a momentous victory to Republicans and religious conservatives who want to limit or ban the procedure. The court, in a 6-3 ruling powered by its conservative majority, upheld a Republican-backed Mississippi law that bans abortion after 15 weeks of pregnancy. The vote was 5-4 to overturn Roe, with Chief Justice John Roberts writing se…