NEW YORK - It's becoming more and more apparent that President Reagan's vaunted skills as a salesman will be severely tested this fall on t he subject of tax reform.
Nobody expected the plan put forward by his administration to sail swiftly and smoothly through Congress and into law. The power of the ""special interests'' to object, obstruct and delay was well known.
But according to pollsters and legislative leaders of both parties, the proposal has failed to stir enthusiasm among the general public, whose backing it was hoped would give great impetus to the push for overhauling the tax system.
In a typical reading, the accounting firm of Ernst & Whinney …