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Along with Ms. Alston, Delegate A. Wade Kach, Baltimore County Republican, successfully submitted an amendment Thursday that pushes the bill’s effective date from October to January, ensuring that it wouldn’t become law until after a potential November referendum.

Unsuccessful amendments included GOP proposals to turn the legislation into a civil-union bill and add protections for parents should the bill lead to homosexuality-related curriculum in schools.

Lawmakers on both sides have acknowledged the bill will likely head to a November referendum. Petitioners would have until June 30 have to collect 55,736 signatures from registered voters.

The Senate version of the bill is currently in the Senate Judicial Proceedings Committee and will likely be voted onto the floor next week, committee Chairman Brian E. Frosh, Montgomery Democrat, said.

The Senate passed last year’s bill, which failed in the House, by a 25-21 vote.