Telling a compelling story is a key component in winning elections. A narrative is the hull upon which messaging is built. NDN used the storyline 'Restoring the Promise of America', connecting the security and prosperity of the 1990s explicitly to the modern Democratic Party:
"The Democrats brought unprecedented prosperity and security in the 90s; the reckless Republican agenda has weakened the nation and failed the American people; and now Democrats have a plan to restore prosperity, security, hope and progress to an anxious world."
There's a historical continuity here, and a glimmer that things that were different and better could be different and better again, under a different political direction.