I saw the whole interview. Conway did her masterful job as usual, but it was not her best interview. She allowed Cooper to land several punches, and she seemed stumped by his repeated denial that "CNN never published the details" that Buzzfeed did. In reality, CNN was lobbing grenades behind the door, and then claiming they never pulled the grenade pins, so no harm no foul. Conway should have called him on this more forcefully. Cooper is a slimy, sneaky bastard. He was splitting hairs and getting away with it.
She did clearly rattle him when she pointed out that CNN's and the media's coverage of Obama on the eve of his inauguration in 2009 was fawning, slobbering, and completely biased.
Cooper had no answer for that, other than to change the subject.
What CNN did was worse than Buzz Feed. They very carefully did not tell the details, but acted like there was credible information that could have been so damaging that Trump was potentially compromised.
They mentioned that the documents had been available for months, but that their Intelligence Sources were now saying that the MI6 agent was considered to be credible. They talked in hushed tones about the “seriousness of the charges”.
So they gave the very real impressions that there was proof that the Russians had been collecting evidence against Trump for unspecified bad acts, which the IC were going to be verifying. That is the worst sort of smear - because there are no specifics that can be refuted.
The Buzz Feed garbage showed immediately that the specifics were so outlandish as to be patently false and not worthy of being repeated.