Illinois' junior U.S. senator picked up two more endorsements Monday -- U.S. Rep. Tom Allen of Maine and Dolly Strazar of Hawaii.
"Most of the primary voters across the nation have now spoken. It is time to bring a graceful end to the primary campaign," Allen said.
Strazar said she is convinced now is the time for the party to unite behind a single candidate.
CNN said the endorsements put Obama's tally at 275 to Clinton's 273. Overall, Obama leads Clinton in delegates 1,866 to 1,697, with six primaries and 274 delegates remaining -- West Virginia Tuesday, Oregon and Kentucky next week, Puerto Rico June 1 and Montana and South Dakota June 3.
A candidate needs more than 2,024 confirmed delegate votes to secure the Democratic Party nomination for president.