The story of Humayun Khan — and his parents — became common knowledge during the Democratic National Convention. Khan, a Muslim American soldier, was killed in Iraq in 2004 when he ran toward a suicide bomber, saving the lives of the men he was in charge of.

Khizr Khan, the soldier's father, told the story of his son's life and sacrifice powerfully at the convention — while chiding Donald Trump for his comments about banning Muslims from entering the country. Trump attacked Khan as a Democratic shill, playing on grief to help elect Clinton.

Khizr Khan is back. This ad, released by the Clinton campaign on Friday afternoon, features Khan telling his story again.

It shows Khan walking through his home, looking at his son's medals and pictures. The 60-second ad ends with a close-up of a teary-eyed Khan saying this: “I want to ask Mr. Trump: Would my son have a place in your America?”

It's a remarkably powerful ad, connecting Trump's rhetoric on Muslims to the real pain that such a pledge would inflict on Muslim Americans. Real people would be affected by all of these proposals, the ad reminds us. It's not just words by Trump.

The ad, according to the Clinton campaign, will rotate into swing states, including Florida, Iowa, Nevada, New Hampshire, North Carolina, Ohio and Pennsylvania.

I'm not sure that any ad fundamentally alters the trajectory of this race. TV commercials have become less relevant as the number of people watching traditional television live has declined. Plus, Clinton and Trump are totally known figures about whom very few people lack an opinion.

But if there is an ad that breaks through the clutter while also reminding people of the stakes in the election, this might be the one.