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He appeals to the majority of people in the US, the working class.
Even if he wins the popular vote, superdelegates could override it
While the contention is feasible, it constitutes a prediction. It is not an argument well suited to this format due to the vast number of factors involved.
While he does very well with white demographics, he does very poorly with minorities. Unless this changes, he will not win the nomination.
Most minorities are more familiar with Hillary Clinton right now than Sanders. Once he wins a state or two, his profile would rise, and he would do better. He has a very good civil rights record.
The general opinion of the internet-enthusiast youth is in favour of his presidency.
This makes up only a small portion of America's electorate
Only around 20% of youth have participated in past elections.
Bernie Sanders has pulled enormous crowds filled with young voters, unlike before. At best it is inconclusive if young voters will actually participate.
Even if a large portion of young voters turned out, it would be difficult to overcome the establishment. Numbers I saw recently were ~40% young participation and ~20% for the rest of the electorate for him to win. While not impossible, these are not likely.