Vice President Joe Biden visits the April 16th memorial on the campus of Virginia Tech following a campaign stop Wednesday, Aug. 15, 2012. (AP Photo/ Sam Dean, The Roanoke Times)

 

              Vice President Joe Biden visits the April 16th memorial on the campus of Virginia Tech following a campaign stop Wednesday, Aug. 15, 2012. (AP Photo/ Sam Dean, The Roanoke Times)
Vice President Joe Biden visits the April 16th memorial on the campus of Virginia Tech following a campaign stop Wednesday, Aug. 15, 2012. (AP Photo/ Sam Dean, The Roanoke Times)