Democratic Senate hopeful Jason Kander is fighting back against criticism of his loyalty to the Second Amendment with a new ad depicting him assembling a rifle blindfolded.

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"Sen. Blunt has been attacking me on guns. Well, in the Army, I learned how to use and respect my rifle. In Afghanistan, I volunteered to be an extra gun in a convoy of unarmored SUVs," Kander says.

"And in the State Legislature, I supported Second Amendment rights. I also believe in background checks, so the terrorists can't get their hands on one of these," he adds, holding the just-assembled rifle.

The Democrat closes with a flourish on the generic campaign ad tagline: "I approve this message, because I would like to see Sen. Blunt do this," he says, displaying the rifle and removing his blindfold.

The National Rifle Association cast Kander as someone who would vote against Second Amendment rights in an ad last week that depicted a home invasion