They couldnt find anyone with any knowledge of the quid pro quo. Yes I know they kept changing the terms as nothing worked.
It was an interesting thing watching the liberal press report on it. After about every witness they would say so and so blew the case open regarding quid pro quo. They conveniently avoided mentioning that on cross by the Repubs, every single witness testified the he or she had no actual knowledge of the supposed crime.
As an interesting aside. They were mad that Trump made comments about the former ambassador Yovanovich (spelling?). She testified that outside of being briefed just a little bit by the Obama admin during her confirmation hearing, she did not know anything about Burisma and the corruption investigation. Documents later came out under FOIA that showed 1) there were numerous emails from the embassy regarding Burisma but 2) she in fact had met with reps from Burisma to specifically talk about the corruption investigation.
Guess which news organizations again didn't bother following up to inform you and others of the new documents that came to light? Not only new documents that contradict her testimony, but documents that showed she in fact lied during the impeachment hearings.