Pamela Paul, who considers herself a liberal Dem (and she is), has a good column on what too often occurs when moderate Democrats disagree with PC progressive Democrats. I’m definitely with Paul on this one: 

“Those on the Democratic side of the spectrum have traditionally been far better at nuance, complexity and compromise than Republicans. It would be to our detriment if policies on which a broad swath of Americans agree are deliberately tanked by a left wing that has moved as far to the left as Republicans have moved to the right. Those who denounce militant fealty within the Republican Party shouldn’t enforce similar purity tests in their own ranks.”