It is a confusing read (probably intentionally), but for the marriage to be valid, it has to be valid in the State you arrive in. So a polygamous marriage wouldn’t be valid unless it was already legal in the State.
But same sex marriage got forced onto many states where it wasn’t legal.
I see the same exact thing happening here.
Nope. It doesn’t matter what your state votes for. By federal statute it’d be legal.
:following:
Ҥ 1738C. Certain acts, records, and proceedings and the effect thereof
“(a) In General.—No person acting under color of State law may deny—
“(1) full faith and credit to any public act, record, or judicial proceeding of any other State pertaining to a marriage between 2 individuals, on the basis of the sex, race, ethnicity, or national origin of those individuals; or
“(2) a right or claim arising from such a marriage on the basis that such marriage would not be recognized under the law of that State on the basis of the sex, race, ethnicity, or national origin of those individuals.”