Amid the Democrats’ celebration over their success in turning out a huge number of black voters in the Senate election in Alabama, party leaders, activists and operatives are seeing a vivid message to increase outreach, mobilization and investment in minority communities.

In the wake of Doug Jones’s victory Tuesday over Roy S. Moore, some Democrats are making the case that the party erred in recent years by failing to put enough of its resources into engaging with black communities, who helped produce the stunning upset in Alabama on Tuesday — and who turned out heavily in Virginia last month as well…

“It’s undeniable that over the course of a number of years, the Democratic Party fell short in our outreach and engagement in communities of color,” said Tom Perez, the chairman of the Democratic National Committee. “We, frankly, all too frequently took them for granted. We’ve really worked hard to make sure we’re mobilizing with people who know the various communities. That is a really important part of what we’re doing.”