Ezra Klein explains why Mitt Romney’s tax plan won’t work.

The reason Romney’s plan doesn’t work is very simple. The size of the tax cut he’s proposing for the rich is larger than all of the tax expenditures that go to the rich put together. As such, it is mathematically impossible for him to keep his promise to make sure the top one percent keeps paying the same or more.

To quote my Grade 8 math teacher, the late Mrs. Burget, “Even you can figure it out. It’s just arithmetic.”