Duke lists his political views as Freedom Fighter, religious views as Humanism, and bought heavily into class warfare rhetoric. This is specified from some of the quotes within his profile, they read:
My Testament: Some people (the government sponsored media) will say I was evil, a monster (V)
no
I was just born poor in a country where the Wealthy manipulate, use, abuse, and economically enslave 95% of the population. Rich Republicans, Rich Democrats
same-same
rich
they take turns fleecing us
our few dollars
pyramiding the wealth for themselves. The 95%
the us, in US of A, are the neo slaves of the Global South. Our Masters, the Wealthy, do, as they like to us
Theres class warfare, all right, but its my class, the rich class thats making war and were winning
- Warren Buffet
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Below this section he has a series of websites that gives us a better understanding of who he is. Some of the links include The Progressive Mind , the (Soros funded, Hitlery cheering) liberal Media Matters , Crimes of the State, Wikileaks Mirrors, etc.
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Of course, this is just information drawn from his Facebook page. However, going from this surface information alone, it looks as though Duke was a liberal who bought heavily into class warfare rhetoric and believed in a few conspiracy theories.