Jason Kander, a Democrat, is challenging Republican Roy Blunt for his U.S. Senate seat in Missouri. And Kander will be getting plenty of attention for his cause thanks to this remarkable new campaign ad he just released in response to Blunt attacking him on the issue of guns.

Kander, 35, is Missouri's secretary of state. He also happens to be an Afghanistan war veteran. And his literally hands-on message about guns leaves quite the impression. Indeed, this is the kind of spot that can swing a race.

Despite the regular mass shootings in the U.S., background-check legislation has not made much headway in Congress, even though the majority of Americans support it. Many Second Amendment advocates say background checks would limit a constitutionally guaranteed right, while those in favor of them say they would keep weapons out of the wrong hands.