Because of his ability to cram a powerful argument into a turn of phrase.
Sully and his husband, Aaron, are in their summer home in New England right now. They're in Massachusetts, meaning their marriage is recognized, while in the District of Columbia--where they live the rest of the year--it hadn't been until today. Sully's comment:
"Ever thought what it's like to be legally married in your vacation home and divorced in your other one? Thought so. Heterosexuals wouldn't tolerate it for a second."