Ahhhh alright. I heard him go in to that but I must have missed the mention of the term.
I'd speculate the political drift he is referring to is responsive to a history of violence. From what I understand, Golden Dawn are Neo-Nazis that, for lack of a better term, stole most of their ideologies from the German Nazis of WWII. Those Nazis for the most part got shut down when the war ended, but none the less... there was a war.
It's still speculation, but I'd guess that origins of the party would have to stem from a support for that - of what it once was. Who knows for sure? Some kid in Greece may have been indoctrinated by the Nazi occupation at the time of the war, and then went on to convince their children of the ideology, and so on and so forth until a charismatic leader emerges.
In that regard, I'd think that political drift is inevitable for now. Until we as a populous have some kind of agreement on what is right, and what is wrong, I think it will continue to happen across the globe in varying degrees.