As an appellate attorney, Wiggins made many of the worse arguments in the history of the court. Some of them were painful to watch.
Is is also pro-homosexual marriage and that is one of the main reasons he won the election. The media also portrayed Sanders as a justice who was a racist when nothing could be further from the truth. Just read his dissent in the State v. Valentine case, where for the first time, the court ruled that it was a crime to resist an unlawful arrest. It was a travesty of justice.
I think that's an unfair assessment. I remember discussing with him his winning the election, and how surprised he was by not only the amount of liberal support he had, but also by the surprising amount of votes he had in areas he spent no time or money campaigning.
That said, your comment made me curious so I dug a little and found an interview in the Seattle Gay News. He clearly states he would have sided with the majority in the Anderson case which upheld DOMA constitutionality. Not exactly "pro-homosexual marriage".
It also seems more likely it was Sander's propensity for siding with criminal defendants that did him in.