I don’t know what he is. You cited an article verifying his membership in Repubs for Choice, and I saw no mention of him, only of his ex-wife. Do you have more to add to this?
I’ll take you at face value as sincere in not knowing.
http://www.nytimes.com/1990/04/24/us/gop-group-formed-to-support-abortion-rights.html
Roger Stone, a leading Republican and longtime associate of Mr. Atwater, is advising the new abortion rights group. Mr. Stone, who is married to Ann Stone, said the party faced serious electoral consequences if it did not ease its stance on the issue. He said implacable opposition to abortion could drive young people and women out of the party.
‘Barry Goldwater Conservatism’
He also argued that an abortion-rights stance was in keeping with the conservative tradition.
‘’I think you can be pro-choice and respect life,’’ he said. ‘’I think that reflects the view of most Republicans. And I believe this is a clear issue of government interference into our private lives. As far as I’m concerned, that’s basic, Barry Goldwater conservatism.’’
Ms. Stone said the group already had almost 200 elected officials signed on to its advisory board. Among them, the group said, are Representatives Nancy L. Johnson of Connecticut, Jim Kolbe of Arizona, Ronald K. Machtley of Rhode Island and Tom Campbell of California.
https://www.washingtonpost.com/archive/local/1990/08/03/abortion-rights-focus-of-gop-bid/5f8e2007-debf-48d7-8a56-d72e2b82117a/
Learn to use google