efforts aimed at preventing more tragedies like this. we won't prevent them all. but that can't be an excuse not to try. >> reporter: vice president joe biden will lead that gun violence task force, which will give its recommendations to the president in january. rob and sunny? >> thank you, t.j. again, the president made a point of saying yes, look, this is not a commission where we're going to study this for 20 years. they have until the end of january to get something done. so that's fast turnaround, considering how much is on their plate. >> and what's fascinating is people are so concerned about gun regulation that now they're just flying off the shelves. so at walmart, all these guns or semi-automatic rifles are just flying off the shelves. apparently one store in particular had the best sales yesterday, more than $1 million in sales since the store opened in 1959. that's the hyatt gun shop in charlotte, north carolina.