Wikipedia adds: "So what?, common phrase used in response to a seemingly irrelevant, uninteresting, or inconsequential statement" and then lists usage by a lot of musical and singing groups.
It also, in the google summary, alludes to a misquote in England's parlaiment, "In March 2008, Balls sparked controversy by appearing to reply to David Cameron's assertion in parliament that the government had presided over the greatest increase in overall taxation of all time with the phrase "So what?" Balls maintained that he had said "So weak!", in response to Cameron's previous questioning, and this was the phrase that was recorded in the parliamentary register Hansard, but the incident remained highly controversial.[2]."
But most important, I find a youtube video and a transcript:
CHENEY: On the security front, I think there's a general consensus that we've made major progress, that the surge has worked. That's been a major success.
RADDATZ: Two-third of Americans say it's not worth fighting.
CHENEY: So?
RADDATZ So? You don't care what the American people think?
CHENEY: No. I think you cannot be blown off course by the fluctuations in the public opinion polls.
And here's the video:
Note the smarmy, "go f*ck yourself, I don't care what you think" face he makes, which I've put higher in the article.
Now, when I say, "So?" as the title of my article, having put the word into quotational context, I'd like you to consider it as the use of the word ala Cheney, but used as a response to right wingers who say that after five years, over 4,000 dead and 30,000 maimed Americans, leaving Iraq without a win, without "victory," will be a disaster, cause chaos, cause hundreds of thousands of deaths.
I say, "So?" And I say it with the full "f*ck you" meaning that I believe Cheney gave it-- but to people like George Bush, John McCain, Shelby Chambliss, Joe Scarborough--
So?.... So Go f*ck yourself Dubya and McCain and anyone who thinks it's just peachy to keep this abomination in Iraq going. So? Go f*ck yourself when you claim that leaving will definitely cause a bigger catastrophy.
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