I have posted this at least 50 times before, it's not my fault people either don't read or simply make assumptions.<quoted text>So after a year and a half of posting, you finally said what you could have long ago. I agree with your post, I will however say that the Prop 8 ruling could have a little more power that you think. For instance, any of the states that currently allow same sex marriage will see that any chance of removing it, will be rejected from the start. To the best of my knowledge SCOTUS has not been asked to decide if Same sex marriage must be mandated in every state. That however does not mean that they won't. Part of the problem comes with portability in a marriage licence granted by one state and not recognised by others. I do not know of any heterosexual marriage that is not recognised from state to state.
And as far as "portability" goes, there is no constitution requirement for that. The only reason a marriage license can be carried from one state to another is because they have allowed it since the requirement have historically been the same in each State. This is not the same for concealed carry permits, nor is it the case for a driver's license- if you move from one state to another you will be required to pass their driving test and receive a license from their State.
There is nothing in the Constitution that allows for one State to compel another to accept it's laws.
The SCOTUS has already ruled as such:
"Its sole purpose was to declare to the several States that, whatever those rights, as you grant or establish them to your own citizens, or as you limit or qualify or impose restrictions on their exercise, the same, neither more nor less, shall be the measure of the rights of citizens of other States within your jurisdiction."- Slaughterhouse Cases