It is very doubtful that the Obama phenomenon will be repeated tonight in Iowa. Iowa is a rural and conservative state. It always favors the establishment.
Both Obama and Hillary represent the capitalist establishment.
If the contest in November is a Trump vs Hillary event, thousands of angry leftists will stay home, ushering in a Trump presidency.
Only Bernie Sanders can save the Democratic Party from defeat in November.
The voters have the final say. Bernie needs a HUGE turnout of new voters tonight.