Amo da morte viva com conhuntos
Political discourse is a discourse in the from of an essay, that is, to the extent that it defines purposes:
The appeal to reason.
The appeal to emotion.
Try to be persuasive, to get the approach your are looking for, usually when it is directed to a large group of people.
As they are speeches, they are prepared to have grater emphasis on the required place.
D, insight.
Perspective is simply a fancy word for viewpoint, so when we are talking about an author's viewpoint, it wouldn't be said as bias, prejudice, or objectivity. Yes, depending on the content of course, but in general, when it comes to perspective, it'd also would be called insight.
I personally say myself its the last one