In Massachusetts, lawmakers have approved a measure that could lead to the repeal of the state law allowing same-sex marriage. Massachusetts is the only state in the country where same-sex marriage is legal. On Tuesday, the state Legislature voted to advance a proposed amendment that would overturn the same-sex law. The proposal will go to statewide ballot if it survives another round of voting. More than 8,000 same-sex couples have married in Massachusetts since same-sex marriage was legalized there in 2003.