Trayvon Martin was senselessly murdered this year, a victim of gun violence and the widely criticized “Stand Your Ground” laws that likely emboldened the teenager’s killer. In the wake of her tragedy, Martin’s mother is standing up in hopes of preventing what happened to her child from ever happening again. Watch the video, heed her call, sign her card, and then add your name to this national petition demanding that all Stand Your Ground laws be repealed. (Thanks to Ilyse Hogue for alerting me to the powerful video.)