OK, lets back up here. First allow me to thank you for motivating me to do further research on the issue. I think that perhaps we can both learn something here. It seems that the issue is more complicated that I realized and,, as it turns out, we were both only partially correct.
My position has been that Congress can fully codify Obergfell.
You, on the other hand, are apparently taking the position that congress can legally do nothing.
My position was based on the fact that the 9th Amendment makes it clear that rights of the people are not limited to enumerated rights . Afterall, congress did pass the Civil Rights Acts to ensure that minorities had the right to be free from discrimination.
However, it appears that congress'ability to regulate marriage is limited. This is what I learned, atleast from 1 source
A legislative expert explains the marriage equality bill, its likelihood of passing in the evenly split Senate, and why the time to protect same-sex marriage is now
people.com
Bottom line is that congress is not powerless on the issue