But I'll have to disagree, since the comment above me suggests that there are a significant number of non-American Reddit users who lean more left than the average American, skewing the upvoting patterns. I'd argue that there are a different set of "artificial advantages" on the internet, such as that.
And when I browsed r/politics during the 2016 and 2020 election seasons, it was clear that Bernie Sanders was the favored candidate by Redditors. However, more moderate politicians like Clinton and Biden actually won the nominations.
And the popular vote count is a reflection of the Electoral College process...if elections were actually decided on the popular vote, campaign strategies would be focused more on cities than rural areas shifting the results.