Earlier quoted context omitted.
Nevertheless, /pol/ and r/the_donald were one of main factors why Donald Trump got elected. This crowdsurfing phenomenon holds tremendous amount of power.
What's crazy is that in the Bush/early Obama years 4chan was fairly liberal in terms of politics.
When he failed to achieve his promises - certainly due to republican blockades to some extent - he was seen as a disappointment and trump became THE spanner in the works of washington.
Another important polarizing issue is the vocal social justice movement in colleges, on tumblr, in the media etc. Since it is seen as infringing on free speech where it matters to 4chan (games, porn, unfiltered non-PC conversation, trolling) they are seen as a threat. If the left does not radically defend free speech, even when it is unpleasant or could be considered as hateful while the right promises small government and has crazy libertarian subcurrents then this is actually more value-aligned, at least on the surface, with 4chan interests.
I don't think a timeline where bernie had been the 4chan favorite would be inconceivable.