Barack Obama is picking up another endorsement, a day after securing three more wins in the Democratic presidential race.
David Wilhelm led President Clinton's successful 1992 campaign. He's expected to back the Illinois senator later today.
Meanwhile, Hillary Rodham Clinton is campaigning in Texas ahead of the state's primary next month.
Exit polls indicate that white voters helped propel Obama to his win Tuesday in the Virginia Democratic primary. They suggest he defeated Clinton by about 5 percentage points among white voters in Virginia. It marks the fist time Obama has won the white vote in a Southern state.
Obama's easy wins in primaries in Virginia, Maryland and the District of Columbia put him out in front of Clinton in the overall hunt for delegates. He says it shows he's putting together a "new American majority," drawing people from every region and every group.
John McCain's three wins add to his wide lead over Mike Huckabee. McCain is looking ahead, accusing Obama and Clinton of both emphasizing "America's mistakes" over what he described as the "malevolent intentions" of the enemy.