The most disturbing thing about these charts is that Huckabee is in the top 4. Actually, it’s disturbing that he is in the top 15 given his record.
Huckabee had a popular TV show on Fox. I bet the national cadre of voters know more about Huckabee from that TV show than reading about his governance in Arkansas. It helps that he is a smooth and glib talker. Likability is always a big factor. Not details of your past actions.