Oh yes indeedy-do! Until their propaganda outlets -- the Mainstream Media -- stop embracing a particular lie as no longer viable even among the Useful Idiot class, these leftists cling bitterly to the party-approved storyline, period.
What's really neat, though, is that once the MSM ceases embracing a lie, the useful Idiots either simply begin recycling all of the already completely debunked lies on that particular subject or avoid the subject like a case of the plague. Either way they learn absolutely nothing,