"but doesn't his less then 15% tax rate inspire him to invest and create jobs, instead of parking money overseas?"
Bingo. His behavior underscores the biggest lie they tell to justify coddling the 1%.
His explanation was pure Republicanese. "Who would want a President who paid more taxes than he had to?" I guess the point was that betrayal of principle is a good thing as long as it's seasoned with greed.
He'll now have to carefully avoid saying "job creators" if he ever has to debate Obama. That should work out well for him. He can still say it now because there's no one on the stage with enough integrity to call him on it. They want to use the same lie.