So of the 3.4 percentage points of savings, more than half — 1.9 points — comes from taxes. That’s 56 percent, not the one-third or one-quarter that the Obama was talking about. And I am assuming that Goldman is using the White House’s rosier economic forecasts when evaluating Obama’s plan. (Ryan uses the gloomier ones from the Congressional Budget Office.) I think the Republicans will be pointing this out.