Portolio.com: Hendrik Hertzberg gets stuck in to the fiscal-policy debate this week, with a proposal to essentially abolish payroll taxes and replace them with various sorts of carbon and consumption taxes. It’s not a bad idea: payroll taxes are horribly regressive, and, as Hertzberg notes, they actually exceed income taxes for three quarters of the US population. Hertzberg does his best to paint this proposal as having bipartisan support, but political realities in Washington mean that …