"The numbers never worked out. No matter how hard the Tax Policy Center labored to make Romney’s promises add up, every simulation ended the same way: with a tax increase on the middle class. The tax cuts Romney is offering to the rich are simply larger than the size of the (non-investment) deductions and loopholes that exist for the rich. That’s why it’s 'mathematically impossible' for Romney’s plan to produce anything but a tax increase on the middle class." (our emphasis)
Willard's campaign response? No rebuttal, just trying to smear the messenger, whom the campaign had earlier praised for its "objective, third-party analysis." As Klein continues,
"The Romney campaign has not provided good answers to the questions raised by its own math. But we already knew the Romney campaign didn’t have good answers. If Romney had good answers, he would have made good on his rhetoric and put his plans on the table."
I think that's another way of saying "Put up or shut up, Willard."