Barton, 22, stars in the pre-debate ad released by Mayors Against Illegal Guns.
Back in July, Barton had stopped in Aurora to see The Dark Knight Rises with friends while on a cross-country bike trip.
Stephen Barton, who was shot in the face and neck, asks the presidential candidates for their plans to end gun violence.
Barton, 22, stars in the pre-debate ad released by Mayors Against Illegal Guns.
Back in July, Barton had stopped in Aurora to see The Dark Knight Rises with friends while on a cross-country bike trip.