Lena H. Sun, Washington Post, May 4, 2011 Washington Hospital Center and the union representing 1,700 nurses have reached a tentative agreement after a months-long contract dispute, union and hospital officials announced Wednesday. Nurses at the region’s largest hospital walked off the job March 4 in a one-day strike after contract negotiations broke down. But talks resumed in the past two weeks, and final details were worked out Tuesday, officials said. Representatives of both sides declined to discuss details until nurses vote Friday and Saturday on whether to ratify the contract. ... Washington