From NBC's Domenico Montanaro
Obama picked up another superdelegate, continuing the slow drip in his direction. (He has picked up 12 since March 4th to Clinton's one.)
The latest is former Sen. John Melcher, of Montana. "Melcher says he chose Obama because he believes the Illinois senator has been against the Iraq war since the start," the AP reports.
Melcher served in the U.S. Senate from 1977 to 1989 and is a superdelegate to the national convention based on his role with the National Democratic Seniors Coordinating Committee.
Obama now leads in the overall delegate count, 1,639-1,507. Clinton leads among superdelegates, 255-223.