I am not a native speaker so the term "bias machine" is unfamiliar to me. Is it another word for common sense? Or Gut instinct?
Most biases are perceived to be a negative thing. That's not really accurate, but it's the perception out there since bias often leads to prejudice which then leads to all sorts of bigotry.
Political bias is when an argument is accepted or rejected depending on whether it supports your party or candidate. Facts are dismissed outright or twisted to suit their view. The quickest and arguably the laziest way to try to counter facts or evidence that run contrary to your party/candidate is to claim it's from a biased media. Trump has been incessant with his contention that the media is biased against him. In reality, he's his own worst enemy. He plays the victim, when in reality he's the prime instigator.
Politifact, along with Snopes are two great methods for us to check out the veracity of any incident or statement. They really try to be as fair as possible even as they are exposed to the political slime they have to wade through. It's not their fault when a party becomes predisposed to bending or breaking the facts to support their quest for power.
As for Clinton's overall trustworthiness, I've been pointing this out for a long, long time. Ask anyone who claims she's a liar and what do you get? You get a single comment about being shot at on tarmac. Yeah, she was wrong and has admitted to such. Show where she is wrong about something, anything and you'll find her quite open to change. Other than that, they are simply sheeple blindly following the RNC party lies about her. That's the real "bias machine".