He gets off a pretty good line at the end of a post, paraphrasing Lawrence Summers:
To put the issue more succinctly, let me quote Larry Summers, who once said something to this effect. We don't have a VAT because liberals think it is regressive--it takes more in percentage terms from the incomes of the poor--and conservatives think it is a money machine. We will have a VAT, Summers went on, when liberals figure out that it is a money machine and conservatives realize that it is regressive.
Wiser words were never spoken on this topic.