I don't know if Obama lied or changed his mind. It is impossble to tell. A broken promise isn't always a lie. Either way, it's not something I like about him, though the latter is more palatable.
I do know this: I dislike lying more when the lying tends to cause me to choose to do something I normally would not choose. In this case his 'lie' would have enticed me to vote for him (a little bit), except that I already had decided to. So, I don't feel betrayed, partly because I never really cared that much whether he kept all lobbyists out of his government, though I do care alot whether he vastly reduces their influence.
If someone feels betrayed because they thought about voting for him due to the broken promise, I can fully understand the outrage generated by his 'betrayal' However, the reason this isn't going to get much traction, in the way that Bush's lies did, is not so much as hypocrisy (though that is an element), but because nobody feels really betrayed.
I did feel betrayed by Bush right off the mark, even though I didn't vote for him. He claimed he was a uniter, and I really believed he believed that, and that he would take steps to bring sides together. I liked him more because of the claim. As soon as he started picking his cabinet and other appointees, I could see that it wasn't going to be the case. We could begin arguing about whether Bush is actually a liar or not, but that would be beside the point. The point is that I perceived him as such, right or wrong, and felt betrayal due to it.
And it kept happening. Feeling betrayed time after time, with each perceived deception. That is why I hated Bush lies. The lies actually did manipulate and confuse me about things I cared about. They didn't have the ring of truth, I had to think through them, investigate whether he was telling the truth, and kept finding that, in my view, he came up short.
I am disappointed that Obama didn't know better than to make his campaign promise. He may have deliberately lied in order to capture votes, and that would be even more disappointing. But, I just don't feel betrayed by this 'lie'. In the end it does matter what the lie is about. And it should.
If that makes me a hypocrite, then I guess so. I'll take the label. But, I do think the label is being bandied about as an ineffective means to attempt get people to hate Obama like they did Bush.
Here is the problem, though: Bush was easy to hate, because he was such a jerk in his lies, so arrogant, so brazen, so out of touch. You're mistaken if you think people hated Bush simply due to the lies. It was the whole package, and each thing fed passion into the other. This isn't going to happen with Obama right now.
But, I am sure you'll all keep ardently trying.