The 2012 presidential election can sometimes change at the drop of a hat. Watch CNN.com Live for all the latest news and views from the campaign trail.
Today's programming highlights...
10:00 am ET - GSA spending controversy hearing - A third day of hearings on questionable spending by the General Services Administration takes place on Capitol Hill. Today, the Senate Public Works Committee takes up the issue.
11:00 am ET - Mega Millions winner comes forward - The winner of the third and final winning ticket in the $656 Mega Millions lottery will be revealed in Illinois.
2:30 pm ET - Obama talks economy in Ohio - President Obama will discuss the state of the U.S. economy on the campus of a community college in Ohio.
3:45 pm ET - Romney delivers 'prebuttal' - GOP presidential candidate Mitt Romney will make what he calls a "prebuttal" to the president's Democratic National Convention speech in Charlotte, North Carolina.
6:30 pm ET - Election 2012: The National Security Agenda - A panel looks at U.S. foreign and defense policy issues central to the 2012 presidential election.
CNN.com Live is your home for breaking news as it happens.