Found a lot of historical nuggets in this one that few will know as truth, but many avoid, deny, or ignore. It starts out with current politics, but stay with it.
Of course there have always been history hacks, and non-historians using their interpretation of history for their political ends (secondary sources).
Your typical responsible/authentic Historian uses primary sources when conducting research, and speaking about particular events. That would include writings, eyewitness accounts. newspaper clippings, photos, and artifacts from the time period being discussed.
Secondary sources are everything else.