Kolbe was my Congressman when I was living in Tucson. Everyone knew he was gay, but he never admitted it publicly. So, the author is wrong in that Kolbe was not "openly gay" while in Congress.
In this article from that day, Delegates consider boycott of Kolbe speech, he is quoted saying, "I've never denied my sexual orientation. I just don't make a point of it. It isn't what I do."