The group leading the charge against Maryland’s same-sex marriage law said Wednesday that it has collected more than half the signatures needed to put the issue on the November ballot.

The Maryland Marriage Alliance announced that it has gathered more than 30,000 signatures as part of an ongoing petition drive.

If 55,736 valid signatures of Maryland voters are presented before the end of June, the new law will appear on the statewide ballot. Both sides widely expect opponents to meet that threshold.

“We have been extremely happy with the enthusiastic support of voters to stop the redefinition of marriage in its tracks,” said Derek McCoy, executive director of the Maryland Marriage Alliance.

Recent polling has shown Marylanders nearly evenly divided on the new law, signed by O’Malley in March. It is scheduled to take effect in January.

Both O’Malley and leaders of Marylanders for Marriage Equality, a coalition working to uphold the law, have expressed optimism that voters will do that.