The National Organization for Marriage wants to put HJR-3 on the ballot despite lawmakers passing a measure indicating it must be approved in 2015 or 2016.
The amendment's passage is the first step to putting HJR-3 on the ballot in 2016.
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.
The Senate today did not reinsert the second sentence to the proposed constitutional amendment defining marriage as between a man and a woman.
A group of young adults gathered at the statehouse today to show their support for the proposed amendment defining marriage as between a man and a woman.
The full Senate will likely vote on the measure this week.
Bartholomew County Council President Ryan Lauer is challenging Rep. Milo Smith, R-Columbus, for his seat.
Governor Mike Pence wants to reinsert the second sentence of the marriage amendment so that it could go to voters for approval this fall.
Senate President Pro Tem David Long says is assigning an amendment banning same-sex marriage to the Rules Committee, not Judiciary as originally planned.