Interesting. Polling data indicates a leftward shift among people staying in the Democratic party (although I believe there’s also a sorting effect.)

https://www.nytimes.com/2018/05/23/opinion/democrats-race.html

«It’s difficult to imagine a Democratic strategist advising a future presidential nominee to “claim and achieve record deportations of criminal aliens,” as the mayor of Chicago, Rahm Emanuel, did when he worked for President Bill Clinton in 1996. Black Lives Matter will continue to pressure politicians on issues from policing and housing to criminal justice reform. As the party realizes that its hopes lie in mobilizing its base of black and Latino voters and increasingly liberal whites, they will be forced to take these movements seriously.

If they don’t, they risk the fate of candidates like Mr. Morganelli or Brad Ashford, a former congressman who lost a primary election to the upstart Kara Eastman in Nebraska last week. Both men found that the Democratic base would no longer stand for an older brand of politics that was too quick to ignore the country’s history of racial injustice.»