Palin doesn't help her own cause with her shrill voice and stupid accent. Can't she train herself out of it? It's a national joke, and she is not a dumb woman.
It is difficult to take her serious sometimes. And she is worse than she used to be. She used to come off as serious and was serious. Now she comes off as a joke. She just does.
The irony here is that Hillary Clinton has two or three regional accents that she'll switch on depending on who the audience is. She has a "southern" accent and an "African American" accent (which she uses in some churches), for example, among others. All phony and she's rarely called on it.
http://www.bloomberg.com/politics/articles/2015-04-22/tracking-hillary-clinton-s-use-of-every-american-accent-east-of-the-mississippi
Personally, I like Palin's accent. At least I know that when she talks, I'm hearing what she earnestly believes.