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"Election tourist" was originally a pejorative for more moderate, less race-focused The_Donald conservatives who discovered /pol/ from media coverage. It does not mean "right-wing individual", and the term itself was coined by White Nationalists on /pol/ bemoaning their new more mainstream conservative allies who were making their way onto the site.
4chan was never leftist, but it's true that until around Obama's second term it wasn't explicitly right-wing or White Nationalist. The two major ideological binding threads were Atheism and a soft Libertarianism, and this was true of basically any internet milieu dominated by video game playing white males at the time. In the wake of the beginning of a renewed "culture war" (then centering on women, now centering on blacks) many of these men drifted rightward. This is what happened to Sam Hyde, and virtually everyone who was a Ron Paul supporter. It was this, not a "Stormweenie invasion" (Stormfront is a site whose users are aging White Nationalist 1.0 types who were involved in the "scene" in cities like Chicago in the 1980s — hardly savvy enough to launch an invasion on 4chan and hardly funny or interesting enough for their ideology to spread throughout the internet as fast as it did, unless you attribute this to the CIA or Peter Theil or something, in which case dilate.) that brought 4chan's userbase rightward.
People on 4chan hated George Bush and Christianity. These were the two most proximate annoyances for a young, idealistic and hopeful white male at the time. By the time 2012 rolled around, Obama had been president for 4 years and Christianity had finally lost all cache, something which the endless debates surrounding creationism played no small part in bringing to fruition (seriously). Not long after, it was “tumblr” feminism and leftism, being given a greater platform at the start of the decade, that became the biggest problem for 4chan’s constituents (white, non-normal video game-playing men).
Anything else is revisionism. By the time of Trayvon Martin’s death, 4chan’s representative ideology was crude racism and antisemitism, as well as antifeminism. You can object to this, you can wish that everyone was still a libterarian and pro-weed legalization, but that’s not happening. A website like 4chan (by and for white men who have problems socializing) is going to be right-wing because the political exigencies of our time made it so. If you’re one of the people who defected and became a leftist after 4chan’s rightward drift because you were afraid of upsetting your girlfriend, you are a race traitor and will be executed by Q. Heil Hitler.