It's from a 2006 article by David Sirota.
Mr. Obama Goes to Washington | The Nation
The quotation in context
Obama has a remarkable ability to convince you that his positions are motivated purely by principles, not tactical considerations. This skill is so subtle and impressive, it resembles Luke Skywalker's mastery of the Force. It's a powerful tool for a Democratic Party that often emanates calculation rather than conviction. "I don't think in ideological terms. I never have," Obama said, continuing on the healthcare theme. "Everybody who supports single-payer healthcare says, 'Look at all this money we would be saving from insurance and paperwork.' That represents 1 million, 2 million, 3 million jobs of people who are working at Blue Cross Blue Shield or Kaiser or other places. What are we doing with them? Where are we employing them?"
“Look I know I promised you lasagna but you can’t expect me to make that. I’d have to go out and harvest grain, mill it into flour, create the dough, press the noodles, cook them, and all that before we even get to the cheese and meat! Anyway, here’s some ketchup and raw spaghetti, you’re welcome.”