Democrats have been fighting the melting pot theory and working against immigrant assimilation for years. And it finally bit them back when a boisterous white guy came along who inspired a lot of people to proclaim they want to make America great again.
Now there's no shortage of people ready to change that particular aspect of the Democrat party. Even Bernie Sanders is in on the game: Sanders: Dems must move beyond 'identity politics'.
I dunno. They've used it to agitate their base for so long their voters may have a difficult time letting go. It's the only place where the phrase "diversity is our strength" has any validity. Now if only they could find a place for the whites.