It doesn't matter what's in the closet past or present with most of the left. They aren't the ones claiming the moral high ground. It's mostly conservatives who claim the moral high ground. Who preach about it, teach about it, and want to legislate much of it. The moral high ground is one of the things that separates us from the left.
The guy was designing gay web sites for a customer. And it stings him when this information gets out. That's the news. That's the deal. It isn't about the name change, although many would suspect that the name change is at least in part an attempt to coverup a sorted past. Maybe it isn't, but it doesn't matter. He's resigned because he doesn't want his past dragged up.
I would just tell him "welcome to the world of hardball politics. Our side plays it too. He's just another casuality."
We will see if it matters to them. They started it and some of us won't forget it.