What's the argument that he hasn't? That he hasn't really changed anything and thus it's not worse?
Seriously? That depends on what you think of his policies, doesn't it? I could answer you, but it would just be a list of Obama's talking points and legislative accomplishments. This is such a central question, so I'm really uneasy about this poll. Obama better be able to make the argument that he's changed things for the better more strongly.
Go for it, I'm honestly asking. I really don't see how we're at a net positive since he's come into office. We may be declining at a far less rapid pace, but we're still running the same marathon to destruction we were been on before. All I've seen is a few paper cups of water for some along the way.