SALT LAKE CITY: A few hours earlier, Mitt Romney was marveling at his big crowds and chewing over lines in his victory speech. But now, in a Boston hotel suite, the camera zooms in on a roomful of family and advisers. The would-be president is on the couch, an iPad on his lap, and asking, “So what do you think you say in a concession speech?”

Silence.

His wife, Ann, arrives and sits down next to him. “What’s going on?”

“We’re writing a concession speech,” Mitt says.

“It’s finished?” she asks.

“My time on the stage is over, guys,” the Republican nominee says. Ann stares ahead, stricken. Their sons are in disbelief. The grandkids are crying. The nation, the Romneys are learning, had rejected them.

The dramatic collapse of Romney’s six-year quest for the presidency is revealed in a new documentary, “Mitt,” a rare, intimate look into how a family endures the 24-7 psycho-drama that is a modern US presidential campaign.

The film, which premiered here Friday night as part of the Sundance Film Festival and will be available on Netflix starting Jan. 24, provides a stark contrast to the stilted, robotic caricature of Romney the politician. It shows him as a three-dimensional figure — devoted to the Mormon faith that he played down on the campaign trail, capable of flashes of raw emotion and often harboring doubts about his political abilities.