To deal with the deficit, let the tax cuts expire - Fareed Zakaria

The "Bush tax cuts," passed in 2001 and 2003, remain the single largest cause of America's structural deficit -- that is, the deficit not caused by the collapse in tax revenue when the economy goes into recession.

Those cuts are set to expire this year.

I understand the fear that this is not a good time to raise taxes. But the impact of marginal shifts in tax rates on growth is pretty unclear.