By the time it’s over, this year’s race for president will have cost at least $3.5 billion. The single biggest expense will be campaign ads. Shane Goldmacher, a national political correspondent for The Times, discusses the story that each campaign has been using those ads to tell, 30 seconds at a...

A sheriff’s deputy arrived at Nathan and Danielle Clark’s front door on the outskirts of Springfield, Ohio, in September with the latest memento of what their son’s death had become. “I’m sorry that I have to show you this,” she said and handed them a flier with a picture of Aiden, 11, smiling at...