A new web ad released Monday on YouTube by Senator John McCain's re-election campaign mocks the senator's leading Republican primary opponent, former Representative J.D. Hayworth, for his opposition to gay marriage.

The ad might suggest that McCain supports gay marriage or merely that he believes Hayworth's argument is silly.

The parody ad pretends to be a Hayworth campaign spot where the former congressman touts his political leadership.

“These are serious times that require serious leaders,” J.D. Hayworth says in the ad.

“I'm running for U.S. Senate to take on the most pressing challenges facing Arizona, America and indeed the entire human race.”

“First, I've committed to exposing the secret Kenyan birthplace of the president of the United States.”

“Second, I've stood up against the grave threat of man-horse marriage,” he adds, referring to his comments on gay marriage made last month during an interview on Orlando-based radio station WORL.

The fifty-one-year-old politician called the Massachusetts Supreme Court ruling that legalized gay marriage in the state “dangerous” because it defines marriage as simply “the establishment of intimacy.”

“Now how dangerous is that?” Hayworth said.

“I guess that would mean if you really had affection for your horse, I guess you could marry your horse.”

The former television sportscaster then affirmed his support for a federal constitutional amendment defining marriage as a heterosexual union, a move that would strike down existing gay marriage laws and block the Supreme Court from legalizing the institution.

McCain voted against the federal marriage amendment but supports state enacted bans on gay marriage.

McCain, however, has signaled that he's OK with gay unions. For example, as the 2008 Republican presidential candidate, McCain asked for the gay vote, saying “I will have an inclusive administration and I will be a president for all Americans.” Gay Republicans interpreted his remarks as possible support for civil unions for gay couples. McCain's wife and daughter both support gay marriage.

The ad ends with, “I'm not J.D. Hayworth and I did not approve this message,” then adds, “Paid for by friends of John McCain.”