By Lawrence Hurley WASHINGTON (Reuters) – The leak of a draft U.S. Supreme Court ruling overturning the landmark Roe v. Wade abortion rights decision shows a once-staid body creaking under pressure as its increasingly assertive conservative majority looks to upend the law on a range of major issues. The court’s hard-won reputation as the grown-up branch of government is now slipping away. The disclosure of the draft was the latest in a string of controversies ensnaring the court, intended to be a nonpartisan body. Conservative Justice Clarence Thomas has been under fire from Democrats over the…