Actually, while Justice Thomas was a confessing Episcopalian at the time of his appointment to the Supreme Court, it is my understanding that he has since returned to Catholicism. He was a practicing Episcopalian for 28 years, however; so while Catholic now, he’s certainly not entirely foreign to Protestantism.
Remember, in their own minds they are Catholic ~ unless they're gay of course ~ then they're "special".
Episcopalians are Protestant? Huh, who knew?