Another great question that should be asked is why Mr. Sanders never joined the Democratic Party. Seems he should have been a no brainer for the Democratic Party to court. Instead we have DWS ignoring the base while sucking up to the Republicans and trying to court Jeb Bush's financial backers.

And what you refer to as political expediency is actually a very real divide in the party. Bernie by actions is more of a Democrat in action then Hillary has ever been.