Donald Trump mad after Ben Carson's book outsells his own

Donald Trump unloaded on fellow presidential candidate Ben Carson last night, describing his rival as "pathological" and comparing his behavior to that of a child molester.

The Donald's wrath fell only hours after sales figures showed Ben Carson's A More Perfect Union surpassing his own Crippled America at the top of the New York Times bestseller lists.

NBC News:

"He wrote a book and in the book, he said terrible things about himself," Trump said of Carson. "He said that he's pathological and he's got basically pathological disease … I don't want a person that's got pathological disease."

Trump first compared the two conditions on CNN and repeated them to a 1,500-person crowd at Iowa Central Community College: "I said that if you're a child molester, a sick puppy, a child molester, there's no cure for that – there's only one cure and we don't want to talk about that cure, that's the ultimate cure. No there's two, there's death and the other thing. But if you're a child molester, there's no cure, they can't stop you. Pathological, there's no cure."

At one point in what observers described as a rambling, 90-minute rant, Trump flipped over his belt buckle in an effort to mock the former neurosurgeon, who recently took Trump's top spot in polls of Republican voters, too.

CNN:

Donald Trump on Thursday told Iowa's voters that those who support Ben Carson are "stupid" to believe the "crap" that is his life story, part of a stunning 95-minute tirade that included his most aggressive attack yet on his closest competitor.

The real estate mogul's pugnacious demeanor was a stark departure from the far more restrained Trump on display at Tuesday's debate, when he declined to attack Carson while standing right next to him. He criticized the retired neurosurgeon repeatedly, said Hillary Clinton is playing the "women's card big league," ridiculed Marco Rubio as "weak like a baby" and vowed to "bomb the shit out of (ISIS)."

Both men hope to become President in 2016.