The only recent fly fishing president was Jimmy Carter - Democrat not sure about the representatives and senators.
Dwight Eisenhower was fly fisher - Republican impacted me when I was starting fly fishing back east in my youth. Heck Dwight is the only president I have seen in the flesh at a West Point cadet graduation when I was a kid.
Calvin Coolidge also was a fly fisherman, who were the other president fly fishers ?
I have not studied this analysis yet but will this weekend.