Right, 30% disapprove because he's too conservative. 30% disapprove because he is not conservative enough. 40% figure he is pretty much doing what is possible under the current political conditions.
When you are in a non-election cycle, the disapproval numbers of a president go up because of the dissatisfaction of people who are actually on his side. If it were an election cycle that segment goes down because of comparison to potential opponents.
You got it. I'm very angry and very dissatisfied, but I still think I helped elect the right guy.