Duke did not change his affiliation until ‘88...when he ran the KKK...he was a solid democrat.
Actually it wasn't until 1989 that David Duke "changed" to using an 'R' next to his name. He was (and is) a member of the DemonRAT organization. The 'R' was just a ruse on his part and is a classic case of RINOism. In short, he wasn't a true Republican in the mold of Calvin Coolidge and Ronald Reagan.
Look...He ran very unsuccessfully for president in 88...The vote would have been a write in for most every state but Louisiana.
After that election he then changed affiliations and tried running as a independent. Failed of course.
It was then that he changed to the republican party and ran for something he could actually win, and he did a term in the state house.
Far as I know he is still a repub. He was a young man when he changed to repub, and he has now spent most of his political life as a republican.
The fact is, politicians in Louisiana are some of the most frequent political affiliation changers in the country and maybe the entire western world.
Having said that, you don’t have to worry about Duke and politics because he pled guilty to a felony charge.