Well, it depended on the state in question. For example, *some* states do not allow you to change the gender marker on your birth certificate (which, of course, is used as a form of ID for a lot of gov't shit). So, for example, a trans woman wanting to marry a cis man (cis is the opposite of trans, by the by) would have been denied on the basis of having an "M" as her gender marker.
On the other hand, it also made 'gay marriage' easier in some cases like for me. My gender marker still has an F, so I was able to legally marry my Spouse who has an M.
But now, two people of any sex or gender identity can get married, so it no longer matters. Trans people who get married and then change their gender marker later will no longer have to worry about their marriages being nullified either, so that's awesome!
The only thing I wonder about is the marriage between transmen and transwomen.
On the other hand, it also made 'gay marriage' easier in some cases like for me. My gender marker still has an F, so I was able to legally marry my Spouse who has an M.
But now, two people of any sex or gender identity can get married, so it no longer matters. Trans people who get married and then change their gender marker later will no longer have to worry about their marriages being nullified either, so that's awesome!