So even though Article I, Section 8 expressly provides Congress with the power to “establish an uniform Rule of Naturalization” and to “make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers”, it does not have the power to define what it means in the immigration law when it uses the term “spouse”?
With respect to the number of marriages it recognizes, sure.
I'm pretty sure however, that immigration has NOTHING to do with what marriage licenses that California issues.
This case wasn't called Kenya v. HHS, it was called MA v. HHS. See the difference?