As we are all now aware, Hillary Clinton seems to poll well in some swing states like Florida, PA, and Ohio, while Obama lags a little behind her. That's not to say, however, that Obama does not have good news of his own, as evidenced in California, Colorado, Iowa, Wisconsin, etc. That is also not to say he will not eventually win these states where she is currently performing better.
But as for the CURRENT polls coming out, I'm not too worried when I see her do slightly better, and I'll briefly explain why below the fold.
As a psychology major, I always try and look at the reasons and emotions behind what people do. Though I'm no scientist or professional, I like to think I have a relatively intelligent head on my shoulders and my reasoning isn't entirely nonsense.
As everyone knows, polls done months in advance of state contests are merely snapshots of current public opinion. The main factor that is keeping Obama from doing well in these polls is Hillary supporters (namely women). When polled, one would surmise their is a large chunk of her supporters who will emphatically tell the pollster that it's Hillary or no one. This naturally leads to Obama losing support. That obviously doesn't apply to all of her supporters by any means, but you can't tell me there isn't a substantial amount of animosity, provoked by Hillary, toward Obama right now.
The second factor is Obama supporters when being polled. The large majority of his supporters are fairly confident he is the Democratic nominee, so they (myself and others I have asked included) will of course choose Obama over McCain, but also are much more likely to choose Hillary over McCain. They have nothing really to lose, and are not worried that will ever be the case. It's much easier for them to say "Yes, I'll vote for her over McCain" because she is not really a threat. This naturally leads to Hillary gaining support. Again, that obviously doesn't apply to all of his supporters, but it's much easier for us to pick a fellow Democrat when we think she is absolutely no threat than if she had a real chance. And a majority of us are intelligent enough to understand choosing McCain over Hillary is not a very wise decision.
Also, Hillary is not currently going through the examination the frontrunner or "presumptive nominee" goes through. She is virtually left alone by Obama (who continuously compliments her) and more importantly by McCain. Were she in first place, that most certainly would not be the case.
These combined factors, though incredibly simple, are what ease my mind when I look at some of the polling coming out right now. I have every confidence that will change once Obama is the established and "official" nominee (though I'm not ignorant enough to not know a lot of his success rests on how Hillary carries herself in these final weeks), but until then I expect polls to continue to favor Hillary over Obama in SOME states, but most certainly not all.