The action makes Vermont the fourth state to legalize same-sex marriages . Vermont House and Senate vote unanimously to override governor 's veto of bill . Same - sex marriages will become legal in Vermont on September 1 . Vermont becomes fourth state to legalize same - sex marriage . Jubilant supporters of the bill throng legislative chambers after the override votes .
Vermont House and Senate vote unanimously to override governor 's veto of bill . Same - sex marriages will become legal in Vermont on September 1 . Vermont becomes fourth state to legalize same - sex marriage . Jubilant supporters of the bill throng legislative chambers after the override votes .