We don't need to worry about the 30-legislative review period. Everyone focuses on that, but it has only been used successfully 3 times, and the last time was 1981. Back then, only one house had to pass a motion to disapprove. Since 1984, it takes both houses and the President's signature. Basically, that is too difficult to do in 30 legislative days.

When they want to hurt us now:
1) they ban the use of local tax dollars from being used to implement the law (domestic partners and needle exchange);

2)they rewrite our law (current gun restrictions on the voting rights act, and the Armstrong Amendment allowing religious owned private Universities to discriminate against gays); or

3) they strip DC of its home rule authority (Control Board and repeal of home rule under Boss Shepard in the 1870s).

Don't worry about option 3. They've only done that when we are headed to bankruptcy.

Option 1 (funding ban) is possible, but recognition doesn't cost any money. It has taken 9 years to get rid of the ban in DPs and needles.

Option 2 (rewrite law) is the worry, however that may be fairly difficult in the current Congress. Since we are looking to respect the laws of other states, we are in fairly good shape. The bad guys might be able to attach a mini-DOMA to ENDA, Hate Crimes, or DADT. That's Phil's worry, and a fair one. If we went for marriage equality, instead of marriage recognition, I think that is what we'd be dealing with.