No political agenda here. Just a simple list from my research:
1) A majority of our young people, the first generation that has not known life without the internet, support him. I call them the 'Connected Generation,' a term I invented that was accepted by Urban Dictionary.
2) When the housing crash happened, this was caused by greedy corporate types who sold investors a bill of goods on shaky financial instruments like 'mortgage-backed securities'. At its height, the crash caused foreclosures on homes to rise from an average of 2,000-2,500 per day up to more than twelve thousand a day. Families were ruined, whole housing developments were abandoned, divorces were rampant, children suffered as a result - and many Americans have not forgotten that. This is Wall Street stuff, and Sanders continues to hammer on this issue.
3) The Average Contribution Figure: Twenty-seven bucks, and no money from oil companies, superpacs, drug companies, or special interests. It shows, unlike Hillary Clinton, that Sanders isn't relying on fund-raising events that cost hundreds of thousands just to sit with George Clooney.
4) He's Jewish, and still willing to meet and discuss issues with the Pope. This proves Sanders isn't closed-minded, and doesn't hold someone's religion against them, even if their views are different.
5) Health care for everyone. Sanders rightly points out that other industrialized countries have done the same thing, and some of them long ago, such as Britain's National Health Service, which has been going since 1948. It isn't perfect, but it's pretty good, and controls both the drug companies and the insurance companies.
6) He addresses working-class citizens and the poor consistently, while ignoring, (and threatening to dismantle) the entities he believes have brought misery to America. It's a big selling point as long as the vote gets out.
7) The idea that Sanders could be trusted with the nukes is far more desirable to a lot of people than if Donald Trump got his hands on them. In today's world, the President has to be a person who can be trusted with such power. Not a radical, a hothead, or a person who uses fear to garner votes. Like Trump for example. This wins Sanders a certain amount of support.
8) There are trust issues with Hillary Clinton. Much of this she brought upon herself by accepting money from superpacs and practically every major industry in America that has an interest in keeping the status quo. Although Clinton might make a decent President, you have to wonder about the money she accepts sometimes. Nothing comes free without a price, and some corporations dodging the rules are worried. So they keep writing her checks. The Sanders people are right in harping on that, because history shows corporate America will often try to influence policy with money.
9) No matter the results of the run between Sanders and Clinton, Sanders is the winner in at least ONE way. He has successfully gotten his message out. This means that even if Clinton wins the nomination, she will be forced to address Sander's supporters. And she hasn't won the nomination yet.
10) The media is beginning to lean his way. Sanders has been largely ignored by the media in favor of Trump and Clinton. But after seven of eight states won lately, and Sanders working New York pretty hard, you have to wonder if undecided voters are finally listening to him.
No matter what happens in the end, if the winner offers the loser the VP slot, they will be unbeatable this November.