In 2008, America voted for hope and change. If Clinton wins in 2016, we can forget about even hoping for change.
Bernie Sanders represents the best hope for real change in America. If not for "dreamers" like Sanders, we'd still be debating whether Social Security, Medicare, and Medicaid were possible in this country, if not still pledging allegiance to the Queen.
As for Sanders being a "radical" and unelectable, he is simply continuing the struggle championed by that other unelectable radical, FDR, who just happened to have been elected four times:
"We had to struggle with the old enemies of peace—business and financial monopoly, speculation, reckless banking, class antagonism, sectionalism, war profiteering.
”They had begun to consider the Government of the United States as a mere appendage to their own affairs. We know now that Government by organized money is just as dangerous as Government by organized mob.
"Never before in all our history have these forces been so united against one candidate as they stand today. They are unanimous in their hate for me—and I welcome their hatred."