Well, I'm a Sanders supporter, and I am happy that he is running, win or lose. Frankly, I am surprised his message is resonating as much as it is. If someone had told at the beginning of the year that a relatively obscure senator with little party backing and no financial resources would become a media phenomenon that would capture the imagination of large segments of the youth of this country, I would have said that person was crazy. Yet, of all the candidates, Republican or Democrat, Sanders is only politician who has succeeded in gaining a strong following among voters under 30. That should be great news for
all Democrats, because it shows that the economic views traditionally associated with the party since the time of Franklin Roosevelt are palatable for a new generation. As a point of contrast, when my parents were about the age I am now, Regan was the old guy who was capturing the imagination of many (white) young people.
Regardless of what the polls show between now and the primaries, an old man calling himself a Democratic Socialist is now a major candidate in a Presidential election. He is and will continue to make appearances on talk shows like The View and Ellen, where he will talk about policies like single payer healthcare through Medicare, publically funded k-16 education, and expansions to social security. Anybody who watches how he is received on those shows and knows about phenomena like the exposure effect:
https://en.wikipedia.org/wiki/Mere-exposure_effect
should understand the implications of that. All of the above mentioned are good policies, and they are policies that should be part of the Democratic platform going forward. By not only running a viable primary campaign, but also energizing the demographic that will form the majority of voters in the coming years, the Sanders campaign should be demonstrating to Democrats that his policies and platform are the direction the party should head in the future.
In my view, this primary has always been more about what the platform of the Democratic party will look like the in the mid to late 2020's, the next time the party has a prayer of actually enacting any of its policies, than it is about what is going to happen during the next Presidency. Although Sanders argues, and I agree, that a strength of his campaign is the ability to bring new voters into the Democratic coalition, even he doesn't go as far as to say that the Democrats will be able to retake the House. The same is true for a President Hillary Clinton. The value in running on an "extreme" economically left platform now is that by injecting those ideas into the political debate and demonstrating their electoral viability it will be more likely that future Democrats will support those policies ........ if they are wise.