The forum ding-dongs who stay ON MESSAGE in blaming voters for who they vote for, added to the genius who constantly demands that a hero emerge with sufficient charisma to sway voters need to read this article. It explains how those in power render invisible any candidates that might threaten the existing status quo. THAT is what it comes down to. They have the POWER to keep these individuals OUT of the public's view.
Just as the popular candy, M & M's began to dye the same chocolate product different colors... the controllers now offer up a few females and a few candidates of color, but they are all full of the same faux filling... and deferential to, as the late Molly Ivins put it, "those that brought 'em." In other words, only packaging is allowed to alter: not content that serves the MIC, big banks, big pharma, big energy, and other corporate hegemonic hustlers.
Mr. Sanders may not threaten ALL of the entities that are harming human (and the natural world's) existence, but he sure as shit takes careful aim at some. And that counts. And that's WHY he's not being given any visibility, or through it, spreading viability... as a candidate.
This is the same protocol that had ONLY pro-war maniacal generals on-air in the uptick for war; and never allowed for open discussions about a genuine health care reform that allotted access to all citizens. It's why global warming was NEVER mentioned on The Weather Channel or most news broadcasts until relatively recently.
Control of media by corporate predators has consequences.