06/24/2010 11:21 am ET | Updated May 25, 2011

John McCain Campaign Ad Blasts J.D. Hayworth As A 'Huckster' (VIDEO)

Arizona Sen. John McCain's campaign is out with a new attack ad blasting Republican primary rival J.D. Hayworth as a "huckster."

The 30-second spot from McCain comes on the heels of a 2007 infomercial coming to light that features Hayworth as a pitchman for seminars promoted as teaching people how they can get federal grant money for free.

The ad features a clip of the television promotion with Hayworth touting, "You may think that what you've heard is too good to be true, but let me assure you, it is real." But then a narrator cuts off the conservative contender and asserts, "Well, it was too good to be true. Twenty four attorneys general condemned this company for promising people free government money, and then ripping them off."

At the end of the ad, Hayworth is assailed as a "pork barrel spender," a "lobbyist," and a "huckster."

In an e-mail to supporters, McCain campaign manager Mark Buse took the attack a step further:

But Congressman Hayworth wasn't just selling a promise - he was selling a false promise. NGC, the company Hayworth recorded the infomercial for, has been widely criticized by consumer rights advocates for fraudulent business practices and deceptive marketing. The company has a rating of 'F' from the Better Business Bureau. NGC even had to settle a $390,000 fraud lawsuit with the Attorney General of Vermont, who called NGC's business practices "unconscionable and illegal" - and that was before Congressman Hayworth decided to sign on as their spokesman!

Earlier this week, Hayworth campaign spokesman Mark Sanders said that the Senate hopeful "hasn't had any relationship" with the company behind the infomercial since it was produced back in 2007 and also fired a shot at McCain over the matter.

Sanders also pointed out that McCain took $9,400 from National Grants Conferences boss Michael Milin for his 2008 presidential efforts and said he is a hypocrite for trying to exploit Hayworth's past association with the company.

McCain spokesman Brian Rogers dismissed the attack from Hayworth's camp and said that the incumbent Senator brought in more than $400 million from 1.5 million donors that year.

"There's clearly no comparison here," Rogers said. "J.D. Hayworth lent his name and the credibility of the U.S. Congress to an obvious rip-off scam... Senator McCain obviously never did that."

WATCH: McCain Campaign Ad Blasts Hayworth As A 'Huckster'