The GOP havent learned that Palin doesnt help with Latinos, since 2008, but yet again, Trump wanted her endorsement. It beat back Cruz.
Polls from 2009 showed her losing big -- and losing in Arizona.
As I recall she did especially badly with people who are not native speakers of English. The best way to speak to people for whom English is a second language is to cleave to the formal register, whatever the language, whatever the level of proficiency the person has in English. Translating political speech in one's mind from standard English to Spanish is difficult enough. Translating botched English to standard English and then to Spanish is even more of a problem.
She was doing far worse than just about every possible other Republican candidate for President of the time. Someone like Mike Huckabee might be a poor cultural match for many people, but at least one understands him well.