You can tell the quality of a candidate by that candidate's enemies.
Let us consider Bernie Sanders.
He is sort of a New Deal candidate whose platform is extremely appealing to most Americans.
Unfortunately, Bernie's message is anathema to the more conservative 'Third Way' wing of the Democratic party, which pretty much holds all the power. The reason is they, like their Republican counterparts across the aisle, are beholden to many corporate and special interests:
-Big oil and coal companies are frightened of Bernie because he has said global warming is the biggest threat we face.
-The military industrial complex is uneasy with Bernie, because they are afraid he'll cut funding for unnecessary stuff. They also don't appreciate him wanting to spend money on rebuilding our outdated and crumbling infrastructure because they believe, correctly that this will cut into their profits.
-Multinational corporations and international bankers dislike Bernie because he is against the Trans Pacific Partnership, which in effect would cost western nations millions of jobs and undermine democracy at all levels. Some see TPP as being the power elite's 'move' to take power from nation states and create a corporate government.
-Wall Street dislikes Bernie because he wants to re-instate Glass-Steagall and generally tighten up regulations.
-Health insurance companies and big pharma hate Bernie because they are on the ACA (Obamacare) gravy-train, and what is ACA but a giant Heritage Foundation corporate welfare program? Bernie is calling for single payer healthcare, and for the government to use it's vast buying power to drive costs down.
-The NRA doesn't like Bernie much because he's called for a differentiated approach - less gun control in rural areas and more in urban ones. Since the NRA represents merchants of death far more than its rank and file membership, his position is, again, anathema to them.
-Big corporations and billionaires dislike Bernie because he wants to raise their taxes and adjust the corporate tax code so companies can't so easily 'offshore' income and profits without paying taxes at all. This is a $20 trillion + problem for the US Treasury. The other reason they don't like Bernie is because he wants to remove the Social Security payroll tax cap and actually expand the program, and again, any benefit to Americans through social programs is seen as a danger to profits.
-K-Street lobbyists don't like Bernie because he wants to overturn Citizens United and impose government funded elections. The corporate owned news media doesn't like this because it will reduce their election year profits from overpriced commercials.
There's more, but that's enough to illustrate my point.
Now, to your question. Wasserman Schultz and the DNC is firmly in Clinton's camp because Clinton is the establishment candidate. The media, which is corporate-owned is downplaying or downright ignoring Bernie. Polls paid for by establishment sources are purposely skewing in favor of Clinton. Post debate feedback showing Bernie coming out on top is being deleted from media websites.
Basically, the only people who like Bernie are ordinary people, because every single plank of his platform is favored by a majority of Americans. I believe very strongly that Bernie is the ONLY candidate running that actually cares about me or my family, and I know his policies will make my life better.
So there you have the answer, or at least AN answer from the perspective of one person. I’m not alone though. And one other thing:
To all Bernie supporters – we know the quality of our candidate by his enemies. That’s why Bernie needs all of us as friends!
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You said it so beautifully. Bernie cares and he is running to make things better for all of us. 
