Yes, it would be nice if more of Obama's supporters were also at least somewhat aware of his policies. I suspect there are a ton of Clinton supporters, though, who are equally lacking in knowledge. It wouldn't make for as interesting a news story, but there are plenty of people who will reference things like Clinton's "
35 years of experience" as why they support her over Obama.
As for Obama being a "rock star"...part of why people got so crazy about The Beatles is because they were genuinely great and new and exciting for their time. When it comes down to it, I'd rather have people get so excited that they faint over a politician than a musician.
Oh, and btw, personality matters in a president. A lot.
It's almost impossible to accurately predict what a president will be like, based on their policy proclamations (that's not to say they're not worth paying attention to). Our most recent example, Bush, ran in 2000 saying that we should be less involved as the world police. Now look at us.
I really like a lot of Obama's policies: they're rather similar to Clinton's, but where they're different I think they're much better (technology is an issue I'm particularly concerned about). Where Obama comes out far ahead of Clinton, though, is his personality. Obviously it's impossible to truly know the man from my vantage point, but from what I can tell he is much more the kind of person I want in the White House, leading this country, putting a team of advisors together, etc, than Clinton.