Live Breaking News & Updates on It wasn ta very rational decision

>> they talk about gun rights, what about chris' right to live? >> reporter: what was it that drove to you do that? >> it wasn't a very rational decision. i have to tell you. i just did it. i can't accept the way he died. it was preventible. and it's going on every single day in this country. too many have died! we should say to ourselves, not one more. >> reporter: an impassioned plea becomes a rallying cry at the university's memorial. >> not one more! >> reporter: "not one more" backs a hash tag. and then 2.4 million postcards then this grieving father with every time for gun safety delivering them to lawmakers across the country. >> 60,000 to marco rubio in florida. i delivered postcards to the governor of pennsylvania. >> reporter: five states and still counting. he quits his job, successfully

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