Do Democrats and progressives need a marriage counselor or a divorce lawyer?

Many moderate and liberal Democrats believe the party should sideline progressive advocacy groups.  The groups sometimes make extreme and unpopular demands that damage the Democrats’ brand and prevent needed compromise.  It appears to me that some critics would be happy kicking the groups to the curb. 

Second, it’s important to persuade progressives that they belong in the Democratic party.  This means persuading them that they need to be open to compromise and tone down their unpopular rhetoric, but also that the Democrats can and will give them an important part of what they want.  Few people endorse the more extreme items on the progressive policy agenda, but an acrimonious, public divorce could easily alienate reliable voters and cost Democrats a close election.  It’s essential to criticize activists or politicians who make extreme demands, but that should be coupled with a clear statement of support for the elements of the progressive agenda that are fair, sensible, and popular (or at least not too unpopular).