"Fatuous" is a great word but not used much. It perfectly describes her: "the most irrepressibly fatuous politician in America."
fatuous /făch′oo͞-əs/
adjective
- Foolish or silly, especially in a smug or self-satisfied way.
- Feeble in mind; weak; silly; stupid; foolish.
- Without reality; illusory, like the ignis fatuus.