Presidential candidate Rick Santorum has expanded on why he believes gay unions are wrong.

Speaking to a group of conservatives on Friday in Denver, Santorum revisited his 2003 remarks on the groundbreaking Supreme Court decision that struck down sodomy laws throughout the United States. Then-Pennsylvania Senator Santorum compared such unions to “man on dog.”

“I said, if the Supreme Court gives to individuals the constitutional right to consensual sexual activity, then you have the right to incest, you have the right … to polygamy, you name it, you have the right to anything, if it's consent.”

He added that the gay community went “ballistic” and the mainstream media asked him to resign “because I was comparing homosexuality with incest and other things.” (Those other things being bestiality.)

“No, I wasn't,” Santorum continued. “I was saying, if the standard is consent, then how do you rationally draw the line? You can't. And they aren't.”

In a transparent attack on Texas Governor Rick Perry, who recently said he believes the 10th Amendment gives states the right to decide on gay marriage, Santorum said the party was drifting away from its core values.

“There are some in our party who say, 'Well, if New York wants to pass same-sex marriage, that's fine with me,'” he said, then added, “Abraham Lincoln said it best: We do not have the right to do wrong.”

Santorum went on to say that New York had “destroyed” marriage. (The video is embedded in the right panel of this page.)