This is REALLY funny!
Billy Kristol, as an entertainer, PROBABLY makes most of his money as compensation rather than return on investment. He is just being jealous and stupid. The same tax laws apply to him as well as Romney.
Romney and others who make most of their money from investment, pay taxes on return on investment. If THAT rate is raised, especially with current interest rates, it will drastically reduce investment. Why would someone invest money when the tax on the returns would eat up the profit? Without investment, the economy can not grow.
I think that there is a bit that is set in the brain of many liberals that makes it impossible for them to understand this fourth grade math.