An expected Obama sweep of the so-called Potomac primary was delayed after a judge extended voting in Maryland until 9:30 Eastern Time because of bad weather in the region.
In Virginia, Obama picked up the support of Gov. Tim Kaine (D) long ago, and the governor campaigned aggressively for the Illinois senator.
On the Republican side, Sen. John McCain (Ariz.) was projected to win a close race in Virginia over former Arkansas Gov. Mike Huckabee.