Proper rules or protocols of scholarship. If a claim is made, evidence is provided for the claim with citations and links so that the readers can clarify and evaluate for themselves. Arguments, if they are part of the piece, are clear and cogent. If it is a political issue, the source's political leanings are not relevant so long as your source has a history/record of ignoring such protocols as I've mentioned. Rush Limbaugh would not be a good source. Michael Gerson would be.
All of that should have been understood and your question unnecessary.