aw-shucks folksiness

"Aw-shucks" is an expression used in certain areas of the US (rural south and others) that means anything from "You're welcome" to "thank you", possibly to express embarrassment. It's considered "folksy" - very casual, laid back, and to some degree unsophisticated. I would need more context to explain further.

Thank you very much for your explanation. In fact, I'm reading a book about George Bush. The whole sentence is:

"Bonk’s plan for this day was itself a treatment to the effectiveness of Bush’s aw-shucks folksiness. Because of that reputation, Bonk had overcome his hesitance about sneaking the briefcase bomb into the house, providing Bush a vivid exhibit of the terrorist threat."

I

AnonymousIs the first sentence "Bonk’s plan for this day was itself a treatment to the effectiveness of Bush’s aw-shucks folksiness" means that Bonk's plan is formulated because Bush is such a homely person? Does this sentence carry the meaning of helping Bush because of his personality?

Homey (down-to-earth), not homely (unattractive). Yes.

"Bonk’s plan for this day was itself a treatment to the effectiveness of Bush’s aw-shucks folksiness"

The word 'treatment' here makes no sense. Are you sure it is not this?
"Bonk’s plan for this day was itself a testament to the effectiveness of Bush’s aw-shucks folksiness"

Cliveitself a testament to

That's what made this feel so "funny" --- thanks!