The Maryland Senate is delaying debate on a bill to legalize gay marriage.
Republican leaders asked that discussion of the bill and potential amendments be postponed until Thursday.
Sen. President Thomas V. Mike Miller said the Senate could gather into the evening that day to consider the bill, which barely passed the House of Delegates last week. Debate could continue Friday before a final vote is taken.
Opponents have offered an amendment to change the bill's effective date and say they have asked Attorney General Doug Gansler for an opinion on the constitutionality of amendments added to the House version of the bill.
Last year the Senate passed a similar measure by 25 to 21.
Miller said he does not believe any of votes have changed in his chamber.