"Survivors of Church Shootings Run as Gun-Rights Candidates: Three men in Texas are seeking public office in March’s Republican primaries"

Stephen Willeford who stopped the 2017 church shooting in Sutherland Springs Church shooting.
Pastor Frank Pomeroy, who lost his teenage daughter, in the Sutherland Springs Church shooting.
Jack Wilson who stopped the West Freeway Church of Christ shooting near Fort Worth.

All three are Republicans. They are following in the footsteps of Suzanna Hupp, who served in the Texas state House.
In Colorado, the state House minority leader, Patrick Neville, was a student at the Columbine High School attack.

Here is a Wall Street Journal article on the top three and a long list of Democrats who have run for public office after these types of attacks.