In Lewiston, Maine, three people were murdered in all of 2022. But in one night this past week, a gunman gave the Lewiston area the sad distinction of being the site of the country's deadliest mass shooting so far this year: 18 murdered, with 13 more injured – husbands, wives, children. Correspondent Lee Cowan looks at how we are responding to the all-too-familiar cycle of gun violence in America.