So in this case I'll hand it off to a bunch of readers of Andrew Sullivan's. This isn't Sully talking about it, these are people who are writing him in reaction. Some of them are thrilled, and they can explain how they see it, and hopefully the optimistic and happy amongst them are correct.
Separately, here's Towleroad blogging from the signing ceremony, where everyone was smiles and handshakes. The bump in the road, tho', was Attorney General Eric Holder not just refusing to comment on Question 1 in Maine, but actively asserting he didn't know what it was. That's just nonsensical, and - no. Frankly, it's bullshit. It's a lie, and he's ducking the question, possibly because they were prepping for another enthusiastic defence of DOMA in Federal court on Friday. In summary, DOMA isn't discriminatory, there is no right to marital benefits on the Federal level, and so on. I haven't seen the actual filing, just the news report, but from what I hear it's not as vile as the first one, but more along the lines of the second.
So there you are. No conclusions, just, well, there you go.