It’s really only a very small but loud minority that is so virulently opposing what Obama is doing. The mainstream of America either support him, or have heard things that make them decide that they might not like it.
News inflames the issue. The town hall issue, for instance – cameras were in most town halls. Only a handful had disruptive and angry protests. Guess which ones showed up on the news? Most of the media is neither Republican or Democratic, but they are sensation driven. They covered anti-Bush protests and they cover anti-Obama protests because it’s good TV. (One major difference between Bush and Obama is that Bush and Republicans screened out this sort of protest while Obama and Democrats let it happen.)
Right now, I’d say most Americans want some kind of health care reform. They’re probably not against paying for it if they reap some benefit (such as the ability to take their health care with them). Some at this point don’t feel that Obama’s plan will give them any benefit and could change their mind if he shows them some advantage. But Obama’s ratings are still fairly good right now.