"The erosion of working-class support — among Black, white and Latino voters alike — has unnerved every ideological wing of the Democratic Party."

"Ben Tulchin, a pollster who worked on Senator Bernie Sanders’s presidential campaigns, said the old political calculations for how Democrats can win elections were now obsolete. 'The math doesn’t work,' he said. 'For years, the belief was Democrats have had demographic destiny on our side. Now, the inverse is true.' Some Democrats hope that this is only a phenomenon of the Trump era, and that G.O.P. gains will evaporate once the president is no longer on the ballot.... But Chris Kofinis, a Democratic strategist who served as chief of staff to former Senator Joe Manchin of West Virginia, who left the party last year, warned that such optimism was misplaced. 'Trump is the symptom, not the disease,” he said. “The disease is the fact that you have lost touch with a whole swath of voters that used to consistently vote Democratic.”... [Representative Ritchie Torres, a Democrat from the Bronx said] 'I am convinced that Donald Trump is a singular phenomenon in American history.... I am unconvinced that his appeal is necessarily transferable to the Republican Party writ large. That remains to be seen.'"

From "The Democrats’ problems run deep, nearly everywhere.This is where voters shifted toward President Trump in each of the last three elections" (NYT)(free-access link, because there are a lot of interesting graphics showing the dramatic shift toward Trump (or something more than just Trump)).