Liddy, Abby and Mary Anne Huntsman in the ‘Jon2012girls Smokin' Ad.’ (Courtesy Jon Huntsman Campaign)

The highlight of Jon Huntsman’s flagging presidential bid: his three older daughters, Mary Anne, Abby and Liddy, who’ve become breakout stars of the mind-numbing GOP primary trail.

They’re pretty and photogenic — which scored them a family spread in Vogue and thousands of Twitter fans. But the “Jon2012 Girls” are pretty funny, too, as evidenced by their new parody of Herman Cain’s viral campaign video.

Cain’s bizarre ad had mustached campaign manager Mark Block blowing cigarette smoke at the camera. The Huntsman women responded Friday on YouTube wearing absurd fake ’staches, big glasses and deadpan gazes .

“We are shamelessly promoting our dad like no other candidate’s family ever has, ” says Mary Anne, as the Cain theme “I Am America” plays in background. “But then again, no one has ever seen a trio like the Jon 2012 girls.” At the end, the three women blow. . . bubbles.

Liddy, Abby and Mary Anne Huntsman in their Twitter portrait. (Courtesy of Liddy Huntsman)

Which kind of sums up the campaign for the Huntsman clan. “It’s a grueling process, so we thought we’d have fun with it,” said Abby. All seven kids — including her brothers and two younger sisters — are on the trail, but the older daughters, much like Meghan McCain and the five Romney sons in 2008, have grabbed the spotlight.

Jon Huntsman and his entire family at his campaign announcement in June. (Spencer Platt/Getty Images)

All three women left their day jobs to join the campaign: Mary Anne, 26, a concert pianist, works on the fundraising side; Abby, 25, who comes from broadcasting, handles media; Liddy, 23, a new college grad, focuses on recruiting young voters. (Abby married consultant Jeff Livingston last year; Mary Anne and Liddy are, said their sister, “completely single and ready to mingle.”)

Despite the dismal poll numbers, the Huntsmans will be with us for at least the next two months, until January’s New Hampshire’s primary. Says Abby: “ We’re going to give it our all.”

Updated. Read also: Jon Huntsman’s daughter dated Kris Humphries, 12/15/11

Jon Huntsman’s daughters and the Romney-mocking video you never saw, 1/18/11

Video: Jon 2012 Girls Smokin’ Ad