Not only does Palpy have Yoda, Mace, and Ki-Adi-Mundi, in the dark about him being a Sith lord. But he actually has them thinking that he's scared to take the emergency power the senate give him.(Ref: ATOC- novelization p. 296)
" By all understanding within the Senate, Jar Jar Binks's words are a reflection of Senator Amidala's desires."
Palpatine nodded grimly, and Yoda sensed a strong fear from the man, as if he knew that he was about to be thrust forward in the most dangerous position ha and the Republic had ever known.
Or is the fact that he's just been told that he's entire plot to take over the republic rides on the oratory skills of Jar Jar Binks!!!!