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I pretty much agree with Xranadu, but I'm going to make a further point. It's not what you're saying that's the problem. In fact, 80% of readers here would probably agree with you that Obama won't change much. And that's precisely the point. The problem is that you came in here with some high-and-mighty comment that pretended to know what everyone else was thinking, when it's obvious that you have not been reading the site or the letters section. If you had, you would have seen the countless Glenn Greenwald columns stressing all of the same points that you bring up, and nearly everyone agreeing with him. However, rather than making some nihilistic pronouncements he makes TWO points: one being that the system is corrupt and constant grassroots pressure must be applied to politicians from both parties, and the second being that NEVERTHELESS, an Obama presidency is preferable to a McCain one, and the national election is not a place to symbolically vent your impotent rage by throwing away your vote.
So yes, you can go on thinking that you're more enlightened while everyone else here is some mindless Obama worshiper, but there's absolutely no basis for it. I personally would have preferred Kucinich, but oh well.