Think of President Barack Obama's budget plan as pursuing two separate goals.
One is, as always, expressing the president's priorities. Instead of giving tax breaks for the "carried interest" of hedge fund managers, for instance, Obama would use some of the same money to provide tax credits for low-income workers, parents needing child care or small businesses. As a result, much of the budget would reshuffle existing spending and devote it to other purposes.
(Read More: President Obama: Budget Is 'Fiscally Responsible')