Obviously, I knew this. Senator Mark Kelly’s wife, the former congresswoman Gabby Giffords, was shot in the head and grievously wounded in a mass shooting outside a Tucson Safeway in 2011. It was one of the most notorious acts of political violence in America.

In several recent conversations with Kelly, however, I was struck by how often and how bluntly he repeated these exact words. Kelly, a retired Navy pilot and former NASA astronaut, seems to appreciate the curt repetition of the statement: My wife was shot in the head. It captures how stark and defining this incident was, and continues to be, in his life.

The near-assassination ended Giffords’s career in Congress and his in space. She was left with acute damage to the area of her brain that controls speech. Kelly was compelled by circumstance to create a new course for himself as a caregiver to his wife, Democratic senator, possible candidate for president, and severe critic of President Trump and his defense secretary, Pete Hegseth.

Fifteen years after the shooting, Kelly and Giffords remain a singular entity in American public life. I went to Arizona to join them at a series of events around Phoenix. We met at a coffee shop. It was a Friday afternoon, with triple-digit heat, and had already been a grind of a day for both of them. From our meeting, they would go to a reception, followed by a dinner, and then Giffords would fly to Louisiana, where she would attend a memorial service for eight children who’d been slaughtered in a mass shooting a few weeks earlier.

Interviewing Giffords and Kelly was like nothing I’ve ever experienced in 25 years of reporting on politics. In our time together, I kept snagging on the same inescapable question: How would their unparalleled dynamic play within the merciless spectacle of a presidential campaign?

She says this by way of introduction, and as a wistful acknowledgment of her name’s cruel irony. Even by politician standards, Giffords was quite the chatterbox. In their joint memoir, Gabby: A Story of Courage, Love, and Resilience, Kelly estimates that before she was shot, Giffords did about 60 or 70 percent of the talking between them. Kelly was the reticent one in the couple, happy to let his wife gobble up the silences. The massacre left Giffords with a condition known as “non-fluent aphasia.” It does not affect intelligence, or ability to comprehend events or remember stories—only to relay them. After Tucson, Kelly says, he started carrying 95 percent of their conversations.

During my visit, Kelly often finished Giffords’s sentences and elaborated on what she was trying to say. She speaks in bursts of words and short fragments. It’s evident when she is trying to express something but her voice is not cooperating. She shakes her head, moves her mouth, rocks back and forth.