No she didn't forget the "K"
Upon close examination of said sign, I do not believe that Sarah wrote the sign.
examine the left side of the sign and THERE, yes there is what Sarah wrote and copied. She even signed her name!
It seems to read “Yeah Michael Moore Sarah Palin”
Could the sign have been “incomplete” when Sarah wrote that? And then finished later?
Why the two crosses (plus signs not typical Christian crosses) in the double-o of Moore?
Now it really does strike me as curious. She really would not be likely to have endorsed the sign in the state shown.