The 2012 presidential election can sometimes change at the drop of the hat. Watch CNN.com Live for all the latest news and views from the campaign trail.
Today's programming highlights...
12:00 pm ET - Brady Campaign gun law reform briefing - On the anniversary of the Virginia Tech shootings, the Brady Campaign will call on Congress to keep guns out of the hands of dangerous people at a briefing in Washington.
1:30 pm ET - GSA spending controversy hearing - Questionable spending by the General Services Administration is at the forefront of a House Government Reform Committee hearing on Capitol Hill.
3:00 pm ET - SpaceX launch preview - NASA will preview the planned April 30 launch of the SpaceX demonstration mission to the international space station.
7:30 pm ET - Romney in Pennsylvania - GOP presidential candidate Mitt Romney addresses the Tri-State Tea Party Caucus in Philadelphia.
CNN.com Live is your home for breaking news as it happens.