Gov. Martin O'Malley signs Maryland’s same-sex marriage bill in March. (Linda Davidson/The Washington Post)

Josh Levin, campaign manager for Marylanders for Marriage Equality, said in a statement that the success of the opposing side in forcing a public vote on the state’s new same-sex marriage law was expected.

Original post: Opponents of Maryland’s same-sex marriage law plan to turn in a final batch of signatures Monday, several days in advance of a deadline to force a public vote on the measure in November.

A 2 p.m. news conference by the Maryland Marriage Alliance could add some momentum to the group’s cause, but the announcement will be a little anticlimactic.

As of 10 days ago, local elections officials had verified more than 109,000 signatures submitted in an earlier batch — well over the required 55,736 to put the issue on the ballot.

Both sides have been girding for a ballot fight since Gov. Martin O’Malley (D) signed the bill in March.

As part of those efforts, O’Malley and House Speaker Michael E. Busch (D-Anne Arundel) are co-hosting a fundraiser for Marylanders for Marriage Equality in Ocean City on Tuesday.