I'm only aware of Massachusetts, Vermont and Hawaii. Hawaii amended its constitution and that ended the fray. Vermont and Connecticut permit legal unions but not marriage. And each of these states has within it the ability to handle its own constitution, as Massachusetts is currently doing through the amendment process.
The DOMA is intended to interpret Article IV, not to interfere in intrastate issues.
The federal Congress should concentrate on what it is being paid to do, and let the states handle those issues that rightfully belong there.