Indiana's laws ban same-sex marriage and do not recognize same-sex marriages performed in other states.
Local Freedom Indiana chapters held community meetings Wednesday evening in fifteen locations across the state to wrap up the campaign.
Political analysts say the measure has less of a chance for approval in 2016 than it would have if it were on the ballot this year.
The Senate plans to vote on the proposed marriage amendment Monday, but it will not be sent to the voters this year.
Lawmakers and legal experts disagree on the consequences of the second sentence of the bill, which bans any legal status “substantially similar” to marriage.
The Elections Committee approved the constitutional amendment in a 9-3 vote.
Many gay rights supporters worry HJR-3 would do more than solidify a ban on gay marriage. They say it could disrupt existing same-sex benefits.
Last week's GOP-commissioned phone survey says 53 percent of Hoosiers surveyed support the same-sex marriage ban known as HJR-3.
After hours of testimony before a House committee, a vote on the same sex marriage amendment, HJR-3, was postponed.
Legislators renamed House Joint Resolution 6 to HJR-3 and filed a companion bill that permits existing private sector benefits.