Fifty years ago most Americans of whatever political persuasion agreed on many issues...economic, social, and defense.
Not so anymore. It is almost impossible to find a Dem who is strong on def., defends traditional morality, believes in free-market capitalism, and is a strong anti-socialist.
To succeed in the mod. version of the Dem Party is to be on-board with all the wacky, leftist initiatives now vomited up by the socialists masquerading as liberals.