Clinton took most of the night's biggest delegate lodes with wins in California, New York, and New Jersey. She also won Arkansas, where she was first lady, and two of its neighbors, Oklahoma and Tennessee, as well Arizona, with its heavy concentration of Latino voters.
The vote in New Mexico was being counted and too close to call.
The Democratic Party awards delegates in proportion to the vote within states. Clinton won 584 Tuesday, compared with 563 for Obama, according to Associated Press estimates. That gives Clinton a total of 845 delegates to date and Obama 765 – still a long way from the 2,025 needed for the nomination.