This board largely represents the ideologies of young people. This group's ideologies have a distinct lack in politics today, which leads to the false conclusion that these ideologies are necessarily not representative of the group at large. I do not know that there is a way to prove these ideological variations are representative of the group at large, but it is certainly not likely to be possible to prove that these ideological variations are not indicative of the group at large.
Actually despite the over-representation of Millennials on this Forum and many threads, actually there are a surprising number of older posters....
Just take a look at the "What was the First Presidential Election You Voted in Thread?" for example, and I was pleasantly surprised to see that although on average I am an older poster on the Forum, there are a ton of individuals, who have been around the block a lot longer than myself...
This includes individuals from multiple political perspectives and backgrounds.....
Sometimes it is easy to look at the huge number of people that jump onto the Forum during Presidential Years (Heavily younger in age) and just see the partisan sniping/ talking points, and all that c**p, without looking into the extreme diversity of political expression and attitudes and dialogue that supersede traditional narratives and discourse.
Statistical analysis and looking at variance reporting is great, but although I agree that the Forum skews to the younger set, "establishment/partisan wrangling" there a great number of posters out here that are open minded and able to both provide their personal perspectives combined with extremely cogent and well informed analysis that offsets the traditionally hackery/trolling that is all too common on political blogs.
Part of the reason that I have always liked Atlas, and still love Atlas....