I imagine it swung hard R in 2016, given Trump's early attempts to distance himself from Southern Evangelical party orthodoxy (though its disingenuity was clear) and, at the risk of going full "Gamergate is responsible for the entire contemporary political landscape", how much of contemporary online far-right thought emerged from the whole greater r/atheism scene. I highly doubt that it outright went R, though.
I would guess that it swung almost equally hard left in 2020 election in part because most of those people are no longer atheists. It's absolutely crazy how many of the militant Amazing Atheist viewers turned into deranged Trump supporters, and then eventually into Christian traditionalist people once Trumpism wedded itself to evangelical Christianity. I've posted extensively about the "leftwing" (and they were leftwing) atheist movement on the internet back in the day, but to put it simply, they never had any principles to begin with, they just had a lot of anger and hatred for society and atheism was a way to justify that anger while also giving them a community of misfits to chat with. Once that died out, the SJW replaced the evangelical as the perpetual villain so they just replaced religion with progressivism and did it all over again. I remember back in 2014-2015 there was a concerted effort to warm these people up to religion, specifically Evangelical Christianity, and it didn't take long for it to work on many of them.
