Watching the front page through the historical lens of hckrnews.com was very insightful. By default, hckrnews shows articles which have made it onto the front page for at least a little bit of time. Then it would continue to display those, highlighting them in HN orange if they were still on the front page, or turning them black when they fell off (even marking them as dead with a faint grey font when appropriate).

Pro Trump articles (and anti Clinton) would appear on in the sea of other articles, but they were always black or grey within a minute or two of their appearance. Pro Clinton articles were about 50/50 throughout the day, some staying, some being voted off.

I attribute a lot of the lost articles to the feeling of "keep HN clear of politics", and a lot more to fringe/fanatical news sites making being flagged, but the overall trend of preferring Clinton to Trump was definitely visible. Bernie Sanders articles were ones which stayed up even longer than the others combined.

So, long story short, yeah, HN is still quite the political echo chamber. It's understandable: many of us share both general job descriptions and life goals; I'd hazard a guess that most even share an age group and fall within a handful of ethnicities.