If President Obama  really wants to see the "Buffett Rule" in action, he should look at California's tax system. The state has been plagued by it for years.

The revenue stream is unstable and the state budget has been a deficit disaster.

Soaking the rich — relying heavily on them for income taxes — has resulted in a precarious revenue roller coaster ride. It's either boom or bust in Sacramento, depending on how the wealthy are faring in the stock market and their other investments.