This is one country, not 50 separate kingdoms. Gays and lesbians have won the right to marry in all but name in Vermont. But the day after one of the most significant civil rights victories in a generation isn't necessarily going to be a honeymoon for the rest of the gay nation. At least not right away. Whether a Vermont civil union counts as a civil marriage in other states is a puzzle.
Nobody knows yet.
There's going to be a lot of soul-searching, particularly in the border states. But Vermont was a very good place to test this issue. They had a grass-roots movement, a friendly legislature, a friendly court. It's not to say what was done in Vermont can't be duplicated anywhere else. It's just that it hasn't been duplicated anywhere else.