In a charitable mood, I am inclined to think that the compelling myth that holds the Democrat party together is the immutable belief that conservatives and Republicans are racists and they are not. This shibboleth they hold fast to despite any evidence to the contrary because they have to. Whatever emotional satisfaction they gain from submission to the tyranny of leftism would be wiped away if they actually considered the evidence of the harm their theories cause in real life. By holding fast to racism as the great divide between them and everyone else, they need never look across the divide to see the wreckage they leave behind.
Believing they are superior on the issue of race and further believing that there is no more important question on Earth, leftists hold fast to their ideology. So when a good-looking, articulate, African-American appeared on the scene, it is understandable that they thought, like the Aztecs on the arrival of Cortez, that they were witnessing the arrival of the Messiah. No critical thinking required.
Besides this fits in nicely with Nathan Bedford said first Maxim of American politics which I now have the shameless opportunity to repeat for the second time today:
All politics in America is not local but ultimately racial.
