Opponents of Maryland's same-sex marriage law on Monday reported that their campaign to spur a referendum on the issue is more than $88,000 in debt.

Documents that the Maryland Marriage Alliance filed with the Secretary of State on the same day it submitted 39,473 additional signatures to spur a November referendum show the group is $88,277.07 in the red. This figure includes an unpaid invoice of $74,530.50 to MDPetitions.com, a petition signature collection company owned by Del. Neil Parrott (R-Washington County.)