WASHINGTON — The U.S. Supreme Court declared today that same-sex couples have a right to marry anywhere in the country, a historic culmination of decades of litigation over gay marriage and gay rights generally.Gay and lesbian couples already could marry in 36 states and the District of Columbia. The court’s 5-4 ruling means the remaining 14 states, in the South and Midwest, will have to stop enforcing their bans on same-sex marriage.A court in Atlanta issued marriage licenses to three same-sex couples today …