The bill, which has already been passed by the state Senate, is within about a dozen votes of the 60 needed to pass the House.
With a change of heart by one South Dakota senator, there are now three Democrats in the Senate who oppose marriage equality.
The conservative Republican from Utah thinks civil unions are a good way to prevent marriage equality.
Detroit Catholic leaders, one a legal adviser to the Vatican, suggest those who support gay marriage be denied Communion.
The close Clinton adviser said he had a change of heart on marriage equality since his last run in the state.
Opponents of marriage equality had sought to muddy the language that voters will see in 2014.
One commentator described this conversation between a mother and daughter as a form of "child abuse."
The centrist Maine Republican has a long record of support for LGBT rights in the Senate, and sometimes it sounds like she supports marriage equality.