By Andrew Chung WASHINGTON (Reuters) -The U.S. Supreme Court’s decision erasing the constitutional right to abortion provides a roadmap to end other freedoms involving marriage, sexuality and birth control, its three liberal members said on Friday, while conservative Justice Clarence Thomas urged the court to take just that path. Friday’s 5-4 ruling, authored by conservative Justice Samuel Alito, overturned the 1973 Roe v. Wade decision that legalized abortion nationwide. The court’s three liberals, in a lengthy joint dissent, condemned the ruling as “catastrophic” and legally flawed – one tha…