Where does he get his information? Who undertakes his research or fact-checking? The poor soul burdened with the task should perhaps look for another job.
According to Fact Check.Org:
What percentage of Sonia Sotomayor's opinions have been overturned by the U.S. Supreme Court? Three of her appellate opinions have been overturned, which is 1.3 percent of all that she has written and 60 percent of those reviewed by the Supreme Court.The "source" of Limbaugh's 80-percent observation must be located at the bottom of his manic bag of tricks, next to his supply of Oxycodone.