"On Memorial Day this past Monday, Jill and I visited Arlington National Cemetery. As we entered those hallowed grounds, we saw rows and rows of crosses among the rows of headstones, with other emblems of belief, honoring those who paid the ultimate price on battlefields around the world.The day before, we visited Uvalde — Uvalde, Texas. In front of Robb Elementary School, we stood before 21 crosses for 19 third and fourth graders and two teachers. On each cross, a name. And nearby, a photo of each victim that Jill and I reached out to touch. Innocent victims, murdered in a classroom that had been turned into a killing field.Standing there in that small town, like so many other communities across America, I couldn’t help but think there are too many other schools, too many other everyday places that have become killing fields, battlefields here in America. We stood at such a place just 12 days before, across from a grocery store in Buffalo, New York, memorializing 10 fellow Americans — a spouse, a parent, a grandparent, a sibling — gone forever.At both places, we spent hours with hundreds of family members who were broken and whose lives will never be the same. And they had one message for all of us: Do something. Just do something. For God’s sake, do something."