Overall among registered voters, 41 percent said they preferred Democrats to control Congress compared with 40 percent who preferred Republican control.

Among likely voters, Republicans led by one percentage point, 44 percent to 43 percent, reflecting the tendency for the party out of power to enjoy a turnout advantage in midterms.

The results suggest that the wave of mass shootings and the recent Supreme Court decision to overturn Roe v. Wade have at least temporarily insulated the Democrats from an otherwise hostile national political environment while energizing the party’s predominantly liberal activist base…

For the first time in a Times/Siena national survey, Democrats had a larger share of support among white college graduates than among nonwhite voters — a striking indication of the shifting balance of political energy in the Democratic coalition. As recently as the 2016 congressional elections, Democrats won more than 70 percent of nonwhite voters while losing among white college graduates.