Thursday night, the Knowles family of Bonney Lake, Wash., watched the John Stewart Show and saw the ad for the first time.
"I looked and saw a girl that looked like my sister and we rewound it and sure enough it was my sister," said Brady Knowles.
The first girl in the ad is young Casey Knowles. It's stock footage from 8 years ago when she worked as a TV extra - footage owned now by Getty Images and used by the Clinton campaign.
But they couldn't have picked a more unwilling star.
"It's really sort of ironic that my image would be used to advocate for Hillary when I myself do not," said Casey.
She may only be 17, but Casey has some very strong political opinions. She turns 18 - legal voting age - in April, in plenty of time before the general election.
"It's perfect timing because I have a candidate that I really identify with," she said.
"I've been campaigning for Barack Obama for a few months now," she said. "I was actually a precinct captain at the caucuses a few months ago. I attended his rally a few months ago and I'm a very, very avid supporter."
The Knowles family admit they have no control over how the footage is used. And while they see the humor of it all, they are mildly annoyed.