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would he have done better if the DNC wasn't totally in the bag for Hillary

By "in the bag" do you mean she was a loyal Party soldier most of her adult life, especially in 2008 when she graciously stepped aside and endorsed Obama. Then served as Obama's Secretary of State. Almost all of the superdelegates voted for her because she knew them personally and had worked with them. This is how you build Party loyalty.

As opposed to Sanders who only registered as a Democrat when he decided to run?