Primary and caucus voting in Louisiana, Washington and Nebraska had barely wrapped up before the Democratic candidates were off campaigning in the next big primary region: Maryland and the District of Columbia will go to the polls Tuesday, but the most competitive of the three states to hold primaries that day is Virginia.

NPR: Clinton, Obama Face Off in Virginia

Those who worked in this building, many of you in front of me, and thousands more first responders across the region --firefighters from Arlington County, Fairfax County, Montgomery County, the District of Columbia and many others, they sprang to action, risking their lives so their friends, their colleagues and total strangers, people they had never met, might live.

WHITEHOUSE: Vice President Biden gives Remarks at the Pentagon