Yes, Palin's folksy affectations are obnoxious, and possibly even offensive. But guys: 'nuclear' can, in fact, be pronounced 'nuke-u-ler'. It's called metathesis, and we do it with lots of English words that have an awkward consonant combination. Like 'comfortable' or, in some vernaculars, 'ask'. I don't see anyone running around screaming, "Obama can't pronounce COM-FORT-ABLE!"(although I bet we'd hear about it if he ever said 'aks' . .).
It is ridiculous, and maybe a tad elitist in a bad way, to make fun of metathesis, because you're essentially saying: anyone who doesn't speak absolute dictionary-standard English isn't one of us. For whatever reason, we don't value vernaculars as a rich part of our language; we make fun of them. This is sad, and has gotten us into a lot of trouble in education.
So if I flip next time someone makes fun of 'nuculer' -- you've been warned.