Here's the dirty secret, though. Sarah Palin's annoying manner of speaking is done on purpose. It's an affectation, which is probably designed to make her seem folksy.
But don't forget that she was a TV news reporter, back in the day. Here's how she sounded then.
Yeah, she had a little accent going .... but she knew how to speak once. I seriously doubt she's forgotten how since then.
So you've got to ask .... if she got paid once to speak well, and most likely still knows how to do it -- why does she persist?
In the old clip you linked to she was reading from a teleprompter.
You make things up to support your point of view.