Click to share on Twitter (Opens in new window)

Click to share on Facebook (Opens in new window)

Upstart Democratic presidential candidate Bernie Sanders has been caught in a child-sex probe, a top political source told RadarOnline.com.

“Republican operatives and even Hillary Clinton‘s own dirt-diggers are furiously probing his perverted past writings, and it could blow up his campaign,” the snitch told Radar.

The 74-year-old Vermont senator, twice-married and the father of a “love child,” penned smutty essays that were published in the early 1970s during a stint as a freelance journalist.

In a 1972 writing that he has called a piece of fiction, Bernie described sick sexual fantasies of men and women.

“A man goes home and masturbates his typical fantasy,” he wrote. “A woman on her knees. A woman tied up. A woman abused. A woman enjoys intercourse with her man — as she fantasizes being raped by three men simultaneously.”

He also wrote that 6-month-old babies should be allowed to romp naked on beaches where they can “see each other’s sexual organs, and maybe even touch them.”

He also confessed a fascination with articles about sexual assaults on kids.

“Do you know why [porn magazines] with the articles like ‘Girl 12 raped by 14 men’ sell so well?” he asked. “To what in us are they appealing?”

And as an outspoken Vermont congressman, he opposed 2003 measures that cracked down on pedophiles who travel overseas to prey on kids, and voted against outlawing some Internet child porn.

“He’s a real sicko,” said the source.