<br><br>Gabby Giffords' husband, former astronaut Mark Kelly and current gun-control advocate, spoke with Wolf Blitzer about buying an assault rifle. Watch the video <a href="http://cnn.com/video/data/2.0/video/bestoftv/2013/03/11/exp-tsr-mark-kelly-ar-15.cnn.html" target="_blank">here</a>.