When politicians come on your show and tell bald faced lies, confront them on it. Calling them out on their lies is not taking sides. You guys are so afraid of being accused of taking sides, that you do not follow-up your own questions, even when the politician responds with a howler. If you do not call them out on it, where is the push back for their lying? How else will they be held accountable (in these days of gerrymandered districts and echo chamber politics), as these interviews are the only time when they are exposed to people outside of their bubble? If you do not call them out on their mendacity unremittingly, then in effect you are enabling them.