Aw-shucks charisma

[Fujibei]

I've come across the following in the US media. I wonder if "aw-schucks charisma" is positive or negative. I'll appreciate your help.

*When the campaign ended, Huckabee landed a lucrative deal at Fox News, a path that Santorum, who has a sort of aw-shucks charisma, could also possibly take.
* Unlike Reagan, whose aw-shucks charisma and optimistic demeanor masked his destructive politics, Newt Gingrich is an unlikable demagogue who will repel independent voters.