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I think the Dems are significantly worse than most - or better depending on your view.
For example I don't believe that a left Trump equivalent could win the Dem nomination. We saw that Bernie - who is a pretty mainstream social democrat - couldn't win his party's nomination while Trump - who is significantly more extreme - did. A US political activist once told me that the Dems were significantly less democratic than the Republicans.
The Dems haven't had an open primary since 2008.
This goes for most political parties these days, doesn't it? Internal issues tops actual power and influence over society.