Mr Burns was repeatedly hit "without warning" by the electric shock gun and pepper-sprayed in the face as officers tried to hold him with handcuff and leg restraints, the inquest heard.
Gun control and abortion also polarized the race, with Democrats urging voters to pick the gun control candidate and the National Rifle Association warning that Democrats would take away the right to own a firearm.
Three police officers face disciplinary action for failing to act on a warning that the man who murdered his ex-lover had a gun and had made death threats.