People don't easily forget stories of powerful pastors taking money from vulnerable people who hope they can be cured, or that their prayers will be answered.
Thou shalt not steal another pastor’s sermon?
Recent cases of high-profile pastors who have been accused of lifting others’ material are raising questions about whether pulpit plagiarism is on the rise — and whether it has become a more forgivable sin.
I think it is OK for a pastor to talk about politics to make a point in their sermon, if they can use the topic to help illustrate their point. If using Bill Clinton as an example to illustrate the consequences of lying about adultery will help get the point across, then it is fine.