"Political pressure on Mrs. Clinton to withdraw is growing. A widely known supporter of Mrs. Clinton, former Senator George McGovern of South Dakota, the 1972 Democratic nominee, announced on Wednesday that he had switched his endorsement to Mr. Obama and believed that Mrs. Clinton should drop out because it was mathematically impossible for her to win the nomination.

The Obama campaign also announced four new superdelegate endorsements, those of Jerry Meek, chairman of the North Carolina Democratic Party; Jeanette Council, a member of the Democratic National Committee from North Carolina; Inola Henry, a member of the national committee from California; and Jennifer McClellan of the Virginia House of Delegates. Ms. McClellan also switched from Mrs. ClintonÕs camp."

NYT