Virginia Tech shooting

Gun Violence Takes Center Stage at Democratic Convention
Activists sense a sea change in momentum around the issue

Former Arizona Rep. Gabrielle Giffords, seen here with her husband Mark Kelly, will address the Democratic National Convention in Philadelphia Tuesday night. (Bill Clark/ Roll Call)

PHILADELPHIA — Every couple of minutes, it seems to Daniel Hernandez, someone stops him to ask about gun violence.  

Hernandez is a former intern for Rep. Gabrielle Giffords. He helped save the Arizona Democrat's life after she was shot in the head at a constituent event in 2011.