Democrats will enter the next Congress with one of the largest majorities in a generation after flipping dozens of House districts and at least seven Senate seats, many in communities President Donald Trump had won, KQED reported, drawing on NPR interviews with party leaders. The party now controls a majority of governorships and gained several additional state legislative chambers, the station said.

“I think one of the big surprises for me on Tuesday night was just how deep and wide our election results were,” Democratic National Committee Chairman Ken Martin told NPR. “This was the biggest election cycle for Democrats in the history of our party.” Martin, who has faced criticism from some inside the party, credited a focus on affordability and ending the war in Iran, and he described the results as a “massive repudiation of Donald Trump and the MAGA Trumpers and the Republican Party.” He added, “Now that we’re in power, we have to deliver.”

Martin told NPR that six of the 10 fastest-growing parts of the country are below the Mason-Dixon line and that 40% of the U.S. population will live in the South after the next census, with states including California expected to lose electoral and congressional votes to the region in 2032 reapportionment. Georgia Sen. Raphael Warnock told NPR the midterms were a “proof of concept” that the South is central to American politics, pointing to a multiracial coalition, the election of the country’s first Black female governor in Georgia, and the chance of the first Black U.S. senator from Mississippi since Reconstruction — a race KQED described as one that “may elect” that senator, not a confirmed result in the piece. Warnock called the moment a test of whether Democrats can “build an economy that works for everyday working families.”