Reddit's algorithm of what to show you is based in part on what you've chosen to follow and in part on what is most likely to get you to stay on the site and engage with the content. It's not designed to give you an accurate view of upcoming election outcomes, and is not at all surprising that it might show someone mostly content from one side's fans, regardless of whether they side is going to win or not.
Reddit’s algo is doing an astonishingly bad job if they want me to stay engaged based on the things I follow. I’ve got two seperate accounts one for general stuff, the other intended strictly for NSFW purposes and meeting people with similar interests. I spent maybe half an hour yesterday on the NSFW account blocking everything that wasn’t in my interests, but more and more unrelated (and general) subreddits kept being recommended to me. After a while of this, I gave up and deleted the app, which I can’t imagine is good for Reddit’s bottom line. I’ll probably be back at some point as it is still in my experience the best way to see that stuff and meet like-minded people, but I was kinda shocked at how difficult (impossible?) it was to just keep one account restricted to specific interests that I do kinda want to be engaged with.