I would argue it is naive to believe that single-issues voters to not exist.

They have existed for a long time and will continue to do so. If the single issue is corruption in politics

Reddit is an incredibly liberal website. The fact that is lost is that many independents support Sanders over a single to few issues. There are GOP candidates that align with their other valued issues.

Just like /r/politics is basically /r/sanders, Reddit is basically /r/democrat. It is blind that there are a ton of people who do not agree with all democrat policies. It is also blind to the fact that getting all of your news from Reddit is likely to make you think that every single Republican policy is the devil. It is the akin to those who get all of their news from /r/politics and believe Hilary is the devil.

The same people that bash Fox news as this crazy, bullshit media house go on to believe MSNBC is the media outlet preaching the truth. The thing is, if you were to ask a republican that, they would argue the exact opposite.

One of the major misconceptions on Reddit is that every republican is some far-right religious fanatic. It is the same as hearing conservatives criticizing Sanders for being a dangerous socialist.

There are many political issues that are not direct social issues. The majority of voters are independents, not democrats, not conservatives.

Sanders is winning the independent vote. These people are moderates or independets; they may not share democratic values. They may vote for Bernie solely based on his honesty and anti-corruption rhetoric. For that same reason, if Hilary is the nominee, they may strongly prefer GOP or other candidates over her.