Same sex marriage is already against the law in Indiana, but an amendment would make it nearly impossible to overturn.
It passed the house last month and today the ban passed a senate committee 7 to 3.
Next stop, the senate, where the Republican majority is expected to pass it.
Deane Oliva is the minister at the United Unitarian Church in Evansville. She has performed several marriage ceremonies and has a civil union with her female partner.
"It's not a good use of taxpayer money, it's discriminating, it's not necessary, it serves no secular purpose," Oliva said.
Lawmakers have tried and failed to pass a similar amendment in the past.
But lawmakers say this time a Republican majority will make a ban on same sex marriage a reality sooner, rather than later.
Ultimately, it will left up to voters to decide.
This proposal needs to be approved by two separate elected legislatures before it goes for a state wide referendum.
It can appear on the ballot in 2014.