The conservative Civitas Institute released new numbers showing the constitutional amendment defining marriage with solid support.
If the election were held today, the referendum would pass with 61 percent support. The numbers show little change since September (62 percent) when lawmakers voted to put it on the May primary ballot.
The current level is the lowest in five months -- but it means little because all the numbers are within the 4 percent margin of error. Opposition is also consistent at 32 percent, Civitas reported.
The poll was conducted March 22-25 by National Research. It tracks with a recent Public Policy Polling survey showing the constitutional amendment with 58 percent support.