Yes because the Democratic Party embraces extremism. If you think the democratic establishment is not far left then why else are they so accommodating and welcoming to Bernie Sanders and Alexandria Ocasio-Cortez?
They aren't. Ocasio-Cortez literally beat the establishment to get into Congress, and that same establishment would do anything to keep Sanders from the nomination.
The Republican establishment literally threw their support to Cruz late in the primaries. Maybe you should reconsider which party is more open to extremism.
Incorrect. Many in the GOP establishment wanted someone like Paul Ryan over both Trump and Cruz. At the same time you would see The democratic establishment nearly handing the entire DNC to a Muslim terrorist/anti Semitic Louis Farrakhan lap dog. Thankfully they chose Perez but they almost chose a Farrakhan lap dog to lead the DNC.