Many years ago. I was writing a book about Rush Limbaugh. It was never finished and then I lost most of it through a series of often ridiculous disasters. While the more polished, nearer-to-finished work is gone for good, a large portion of rough, unfinished, earlier versions of most of its chapters and sections managed to survive for many years. I've lost some of them since--more disasters--but I still have some of it and today, while going through it, I found a section in which I'd outlined an example of plagiarism by Limbaugh.
A little background: In 1992, Democratic challenger Bill Clinton and incumbent Republican President George Bush Sr. were duking it out in the presidential race. California Republican congressman Bob Dornan--one of the worst crackpots in congress at the time--would stay up late at night making special-orders speeches from the floor of the U.S. House of Representatives in which he weaved bizarre tales about Bill Clinton's college days, including suggestions that Clinton was working as an agent provocateur for the KGB during the Vietnam war after being recruited during a 1969 trip to the Soviet Union. These were conducted long after the House had finished its business for the day and the chamber was empty--Dornan was just talking to himself or sometimes to another Republican congressman--but the venue granted Dornan immunity from slander suits and his late-night ravings became a popular circus for C-SPAN junkies.
At the time, Dornan was a regular guest-host on Rush Limbaugh's radio show, sitting in when Rush was away. Though unsubstantiated by a single fact, his outlandish assertions regarding Clinton eventually bled into the rhetoric of an increasingly desperate Bush reelection campaign.
In his second book "See, I Told You So," Limbaugh was red-baiting Clinton and revisited this material. Of Clinton's college-era trip to Russia, he darkly asked, "...how about that mysterious vacation to Moscow and Prague in the dead of winter?" Later in the book, he comes back to the subject:
"Six weeks after he [Clinton] helped organize a massive anti-war, anti-U.S. protest in England in 1969, he turned up in the Soviet Union--the pre-Gorbachev Evil Empire that was supporting the communists in Vietnam with weapons and advisors."
"Six weeks after he helped organize a massive anti-war demonstration in London, at the height of the Vietnam war, then-student Bill Clinton turned up in the Soviet Union for a visit during the dead of winter."
If anyone else ever caught this, I'm unaware of it. In more recent years, Limbaugh has had other interesting brushes with the plagiarism issue. In 2012, his newsletter blatantly plagiarized an image from a 2002 Dungeons & Dragons Monster Manual. In 2011, he falsely accused President Obama of plagiarizing him in a speech to the UN. In 2006, he came to the defense of right-wing blogger Bob Domenech who was caught up in a plagiarism scandal. In Limbaugh's fanciful version of what happened, the "left-wing fringe" complained about Domenech and "the liberal Washington Post buckled... and they concocted some phony excuse that the guy that they had hired was a plagiarist... [T]hey couldn't handle the heat from the left, and so they couldn't offend their audience, and so they had to get rid of the conservative blogger. At the same time, they had to put out a bunch of garbage to impugn his character and reputation at the same time." But in the real world, Domenech had admitted to the plagiarism and had apologized for it.