Having had a dislike of politicians from the beginning, he can accept the idea of Palpatine as a deceiver more easily than others--and thus act quicker. Well thats what I thought. I still do in fact, but he said something in AotC which made me wonder. I can't quite remember the correct quote but he said something like:"Do you think it is true that the senate is in control of a Sith lord. Something doesn't feel right." The way that he said it made me think that he was doubting what Dooku told him. I'm just wondering why Lucas put that line in. Either what Dooku told him is a lie and Obi-Wan can feel it or else maybe Obi-Wan will assume that it was a lie and so he won't figure out what is going on until the very end. But then you've got to wonder why such a big deal was made of Obi-Wan not liking politicians not to mention Palpatine himself.