The phrase "quid pro quo" leapt into the popular lexicon in September with the Ukraine story. Over the past decade television news has rarely uttered the phrase, but it has become so commonplace since September 20th as to constitute as much as 7% of airtime on some days.
The timeline below shows airtime on CNN, MSNBC and Fox News using the Internet Archive's Television News Archive that mentioned "quid pro quo" since July 2009:
The timeline below shows the same results for worldwide online news coverage: