At a million-dollar San Francisco fundraiser today, President Obama warned his recession-battered supporters that if he loses the 2012 election it could herald a new, painful era of self-reliance in America. “The one thing that we absolutely know for sure is that if we don’t work even harder than we did in 2008, then we’re going to have a government that tells the American people, ‘you are on your own,’” Obama told a crowd of 200 donors over lunch at the W Hotel. “If you get sick, you’re on your own. If you can’t afford college, you’re on your own....