Hundreds have been killed in mass shootings at a high school in Littleton, Colo., a church in Charleston, S.C., an office party in San Bernardino, Calif., a nightclub in Orlando, Fla., and elsewhere in the past 20 years. After 20 first graders and a half-dozen adults were slaughtered in Newtown, Conn., in 2012, it seemed that a line would be drawn in the sand. Enough was enough, people said. But nothing was done. People have been injured or killed in eight school shootings in the first seven weeks of 2018 alone.

Though many Americans, and some elected officials, have taken a stand to stanch the epidemic of gun violence, the National Rifle Association and its congressional servants have been an unyielding obstacle to sensible reform.

But the gun lobby’s stranglehold on our elected officials does not need to continue, if candidates stand up to the lobby and voters demand that they commit themselves to the sorts of changes that a vast majority of Americans want.

With midterm elections coming up this fall, America has a chance to get that message across. Candidates must realize that reducing gun violence is a winning and moral issue. Aggressive turnout by voters who believe this can defeat the N.R.A. at the polls. Until then, the bloodshed will continue.