That's not an assumption, that's an answer to "how is it possible?". The answer to "how do we know that's the case?" is "polling": http://thehill.com/homenews/c

That's not an assumption, that's an answer to "how is it possible?". The answer to "how do we know that's the case?" is "polling": http://thehill.com/homenews/campaign/329404-poll-bernie-sanders-countrys-most-popular-active-politician http://thehill.com/homenews/campaign/329404-poll-bernie-sand...