[Kaslin]

Not that I agree with it, but I believe he means this part in bold

Amendment XIV

Section 1.

All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside. No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any state deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.

[rjsimmon]

Not quite. This is the stance of the SCOTUS majority:

No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States;

The majority ruling is that if a State officially licenses something, another State cannot fail to recognize it.