Do conservatives, on the whole, speak and write well?
I don't think so. I has not been in my experience. I have long thought that conservatives tended to be poor communicators, Ronald Reagan being an obvious example contra (pardon the pun).
Popular media news outlets tend to edit out the boring parts. They have to do so, being "all the news that fits, we print." TV, in particular, saves the great and interesting "sound bites", and airs those. However, it redacts the endlessly boring stuff. It leaves out the drunken tirades, the spittle, the name-calling, and ad hominem attacks, et cetera. It may or may not keep in the politically incorrect statements, depending on the supposed impact on news: "Dog bites man: not news. Man bites dog: news."