Bernie or Bust?

With the huge number of Die-Hard Bernie Sanders supporters left to decide what to do in the likely event that Clinton wins the democratic nomination, It looks as though their decision may determine the whole race entirely. Democratic establishment will urge Bernie and Hillary supporters to come together and vote for the nominee (Hillary), but many Sanders supports feel as though this move would be against what they truly believe in. But, if Bernie supporters decide to stay with Bernie as an Independent after the convention, will this split the vote for Democrats and pave the road to a Trump presidency?