Democrat Jason Kander, who is challenging Sen. Roy Blunt (R-Mo.) for his seat, appears in an ad blindfolded and standing at a wooden table in a darkly lit warehouse. As he begins to speak, Kander starts piecing together a rifle. The metallic clank of each part falling into place accentuates his argument, and the beginning of the ad establishes his credentials as someone who knows how to use guns, and respects them, too. But despite his proclaiming of support for the Second Amendment, it's not an ad that's likely to make the National Rifle Association happy.