The adoption of state marriage-protection amendments will be a moot point for states if the repeal of DOMA does go through - I can hardly see how such amendments could be a safeguard.
I mourn the fact that we've lost any real chance to pass a Federal Marriage Amendment - the window of opportunity was open a crack several years ago, but the vile moderates, libertarians, and head-in-the-sand, let's-be-nice Republicans thought it was overkill and mean, saying that an amendment could be passed if the dire need arose. Well, the logical conclusion of our apathy and downright stupidity is upon us. Do we think that after state enforced sodomy recognition-as-marriage is forced on us all that the momentum will EVER be regained to pass such an amendment? And that during the lengthy process required to do so, untold injury and outright rape to every decent societal value will not be brought upon Americans in every quarter of society with a raging vengeance by the homo-fascists?
Read the links posted by MassMike and weep. This will be America from shore to shore if the tide is not held at bay and pushed back by some miraculous means.
If a state marriage amendment is in place, the only way for a gay marriages from another state to be recognized in such state is if the judiciary rules that the Full Faith and Credit Clause of the U.S. Constitution mandates that marriages from other states be recognized. The Supreme Court has historically allowed for a “policy exception” to the Full Faith and Credit Clause, and I seriously doubt that there will be 5 SCOTUS votes for the proposition that gay marriages from Massachusetts must be recognized in Idaho.