I don't disagree with your basic point, and I generally wouldn't even consider voting for someone who tends toward socialist reforms. (I supported Ronald Reagan for President at least four or five years before he was elected, and I have always tended to favor a ruthless market economy, balanced budgets, and very tight limits on government spending.) I believe, however, that these are unusual times. The image of this country has been greatly diminished under the current administration. In the 1980s, the U.S. under Reagan was a beacon of hope and an inspiration to many people in other countries, especially eastern Europe. Even in late 2001, after the attack of 9/11, the U.S. had great political capital and support worldwide. I believe that it has largely been squandered over the last six years. The re-election of George Bush in 2004 put the citizenry's official stamp of approval upon his administration's actions, and much of the world -- with considerable justification -- sees the U.S. as an empire-building, self-interested bully that invades sovereign nations, kidnaps and tortures citizens of other countries, and has little respect for the interests, cultures, concerns, and beliefs of others. I believe that, in the long term, that's a big problem.
I also believe that, within the U.S., the abuse of executive power -- the politicization of the Department of Justice, the unprecedented use of Presidential signing statements, the violations of Fourth Amendment rights, the restrictions on the right of habeas corpus, and so on -- has been sufficiently serious that I'm willing to vote against my own immediate economic interests to re-establish an acceptable level of honesty and lawfulness in government. I'm not sure that Obama is necessary to achieve that goal -- perhaps McCain or even Romney would be perfectly fine (not Hillary, who would simply replace one form of executive abuse with another). But I think that there is some value in telling the Republican Party that, since George Bush was their man, they need to take the fall for him.
In any event, I don't think that Obama is all image, or that his election would merely be symbolic. I think that he's an exceptionally bright and articulate person, and a pretty decent guy. Those are good qualities in a President.
None of this, however, means that I'll definitely vote for Obama if given the chance in the general election. I've only made one decision so far -- I'm not voting for Hillary.