According to Fallon, the "Breitbart effect" was the existence of "pro-Donald Trump counter-narratives that seemed to dominate the news cycle" and kept Team Clinton on the defensive. He said that the Breitbart group "cultivated a standalone ecosystem in conservative media that very aggressively and successfully promoted certain stories and narratives we had a blind spot for during the campaign." Essentially, because of the Brietbart group, Clinton needed to address "unflattering headlines" about the Clinton Foundation, her corporate speeches, her health, her record as Secretary of State and the e-mail server scandal rather than attacking Trump for his missteps.
Think about this. So Clinton was running for President and never expected to need to address the scandals that surrounded her, her record of failure as Secretary of State, or her fitness for the job. Can you imagine? What does this say not only about the media itself, but about Clinton's relationship to them. Keep in mind, this is the same media that digs and digs and digs and will raise anything it thinks it can turn into a scandal against a Republican. Their health, their political record and any known scandals involving them are automatic media fodder. Yet Clinton apparently wasn't expecting to need to deal with those things.
What this says is that Clinton knew the MSM was going to cover for her. They weren't going to cover basic things that any journalist should cover even against people they like. In other words, the media is THAT in the tank for her!
This also tells us how inept the Democrats are. Hillary should have been ready to address those things before she ever began campaigning. Those things are part of her known baggage. A competent politician plans a response to things like that. Yet, she and her team apparently didn't even think they would come up.
What's more, think about this: Breitbart is a fringe organization that probably reaches less than 1% of voters. So Hilary's campaign press secretary is dumping their failure on the fact that in a media sea of pro-Clinton groupthink, there was 1% opposition? Is he really suggesting that they weren't prepared for their to be even token opposition? Wow.
This is pretty shocking actually.