By Andrew Chung (Reuters) – The leak of a U.S. Supreme Court draft opinion that would overturn the constitutional right to abortion is an major breach of confidentiality that has heightened the stakes in an already politically-charged case, experts say. Politico on Monday night published a draft majority opinion that it had obtained striking down the landmark 1973 Roe v. Wade decision, which guaranteed the right to abortion nationwide. It was a sign that the court’s 6-3 conservative majority was ready to flex its muscle. While the substance of the draft sparked praise from anti-abortion conser…