Comey did no such thing.
He verified that they have nothing on President Trump.
He and Adm Rodgers both defended their own agencies by testifying that they have no evidence as of yet that anyone in their organizations was responsible for abusing FISA or spying.
So either it was some other agency, i.e. CIA, DIA or Team Obama that broke the law, or some rouge agents in their own organizations were on the hook.
Basically , Comey and Rodgers testified that they were personally clean, Trump was clean and President Obama was clean as far as they could tell.
Next step is unmasking the perps.
Or it was the Brits as Judge Napolitano claims.