The father of a man who was killed in the 2012 Aurora, Co. movie theater shooting was elected to the Colorado House of Representatives on Tuesday night, unseating a GOP incumbent on a platform that revolved around gun control.

Tom Sullivan, whose son Alex died in the mass shooting that killed 12 and injured 70, won the state House seat for District 37.

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"[Lawmakers] never wanted to talk to me before, and they're gonna have to talk to me now," Sullivan told local NBC affiliate 9News. "I've already had the worst day I'm ever gonna have."