Perhaps the greatest danger to a Trump reelection is a disgruntled hard left. So while I like the fact that Bernie hits the fat cats on Wall Street hard, I see Bernie as more of a revolutionary type than a statesman, and revolutionary types seldom work out well as heads of state.
But if on the other hand Bernie does not become the Democratic nominee, I fear that the far left Democrats will throw a fit and either vote for Trump or some liberal third party candidate giving Trump a second term. Not good!
So for that reason alone maybe it is better to see Bernie win the Democratic nomination.