"Doesn't matter. The story that Ryan lied is out on the AP feed, picked up by Yahoo, MSN, and every other lazy-assed "news" organization then published far and wide, in both print and electrons... These rebuttals are preaching to the choir, never traveling beyond the hyper-political conservative blog-o-sphere. The average news consumer, who just glances at headlines and accepts them as fact, will believe them without question since it fits so neatly into the convenient narrative the LSM has been crafting for the last 4 years."
Then your job- and our job- is to counter the lies. We're not going to change the minds of the narcissistic, hardcore leftists- but open-minded people will listen and can be swayed. (I know this from personal experience- it surprised me, in fact).
Well, no argument there! We all touch as many as we can with reasoned arguments and a healthy dose of common sense. I've had the same experience as you, enjoying some success in dispelling the nonsense to my less-political friends and aquaintances. But I have no illusion that many will slip through the cracks.
I'm simply pointing out how daunting the task is given the impending onslaught of disinformation still to come.