"The idea that the Democrats are going to save us is ridiculous,"...

[Dont Taz Me Bro]

Further proof that Democrats and liberals are not 'the left,' that the Democratic Party is centrist, moderate, and represents the views of a majority of the American people.

And because the Democratic Party is centrist and moderate, it rejects extremism from both the left and right.

The Democratic Party is neither centrist nor moderate and hasn't been in quite some time. They just haven't gone quite far left as the Greens, yet, but they're working on it. Sanders is evidence of that.