The caucuses in Washington State wrap up at 5 pm ET, with the Virgin Islands contests ending an hour later. Nebraska's caucuses conclude at 8 pm ET, and polls in Louisiana close at 9 pm ET.
Maine has a caucus tomorrow as well.
Look for Obama to do very well this weekend. He'll win Washington, Nebraska, and Louisiana. No polls for the US Virgin Islands or Maine, but Obama could do very well there.
Tuesday is the "Potomac Primary" - DC, MD, VA. He'll win all three by solid margins.