Bernie Sanders' secret weapon? Reddit.

The Bernie Sanders campaign still faces an uphill battle challenging the Clinton juggernaut for the Democratic nomination, but there's one place where he's already won: Reddit.

If you're not familiar with the site, Reddit is a massive online forum that allows users to "upvote" and "downvote" user-submitted content, and it's divided into subreddits, which are single-topic forums users can subscribed to or ignore according to personal interests.

Sanders currently has more than 80 subreddits devoted to his cause, including one for every single state plus Washington, DC. The primary subreddit of the bunch, r/SandersforPresident, has nearly 100,00 subscribers, meaning there are lots of upvotes constantly pushing pro-Sanders content into the view of Reddit's 203 million monthly visitors. State-based subreddits have played a key role in organizing for real life events, too, helping Sanders pack stadiums with thousands of supporters.

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This is not the first time Reddit has cottoned to a presidential candidate: In 2008 and 2012, Ron Paul was Reddit's choice for aggressively upvoted underdog, to the point that frustrated non-Paul supporters created an r/EnoughPaulSpam subreddit in protest.