[Kobi]

Opponents of gay marriage tried the same tactic here in Massachusetts. It was shortlived and pretty pathetic given the lameless of their rationale.

Each state has laws that govern the requirements for obtaining a marriage license and for denying one. "Recognition of a marriage outside of the Commonwealth" is not one of the reasons that can be used to deny a license here.

Is there something in Canadian law that allows a marriage license to be denied because the marriage would not be recognized somewhere else?

Divorce is trickier. Again, the laws of the state or country of jurisdiction prevail. In Mass, both straight and gay couples have to adhere to certain requirements in filing for divorce. Residency is just one of them.