OK, so he's a white supremacist who pretends to be Jewish and pretends to have a black husband. Totally makes sense.
Seriously, there is no evidence that he has white supremacist beliefs. He hates political correctness and radical leftist ideas. The SJW's/leftists are offended by his criticism and call him a Nazi. Everyone who disagrees with leftists is called a Nazi.
But that's not what I think is going on with Milo; in his case, I think that being ethnically Jewish and married to a black person are absolutely not barriers to associating with white supremacists, anti-LGBT-rights activists, misogynists, etc.
AFAIK, his partner's name is John Lewis.
That being said, marriage licenses are private for obvious reasons and apply to that partnership as outlined in https://health.hawaii.gov/vitalrecords/about-civil-unions/
Relevant:
> The Department of Health can provide certified copies of legal records to verify civil union status in Hawaii to those who are entitled to receive copies pursuant to state law
I got a chuckle from reading that the Domestic Union in Hawaii was signed by Governor Abercrombie, admittedly.
He's Catholic, nobody has ever seen his husband, and there is no public record of his marriage.