The Democratic Party's historic establishment is worried Sen.
Bernie Sanders could win the 2020 presidential nomination.
Business Insider reports Democrats fear Sanders might take the party to the left.
If he takes the party to the left many say he'll get crushed in November by President Donald Trump.
There are similarities between the Democratic Party right now and what just happened to the Labour Party under Jeremy Corbyn.
Trump and his supporters are hoping Sanders will win, too.
Trump thinks Sanders would be easy to beat.