Big network reporters are mostly Democrats and their bias is apparent to non-democrats. Legacy media gushed over Obama so much that even SNL made fun of it. Trump was such a hard contrast to Obama that some media personalities said impartial presentation was no longer important as getting rid of Trump was priority. Bush had been literally Hitler before Trump came along. With Bush safely behind us he was suddenly not so bad, as Trump was even more literally Hitler than Bush. Before Bush, Clinton's rape and sex scandals did nothing to reduce his long term popularity among Democrats. By contrast a rape allegation that cannot be corroborated by any of the supposed witness is presented as cause to sink a Republican Supreme Court pick.

John Stossel had been a highly successful legacy media personality. When his reports began shifting from left to more libertarian, he found himself on the outside of that bubble. He says that legacy media is so steeped in their own political bias that they don't know it is bias, much like a fish not knowing about water. White House Pressers are no different. Of course this comes from my own biased media consumption, but my bias puts me outside legacy media bias, enabling me to perceive it more obviously.