Catherine Rampell: Trump's tax proposal won't actually help the middle class. Here's what would.

President Trump campaigned on helping the little guy. His latest tax proposal, he says, is about helping the middle guy.“It’s a middle-class bill,” Trump promised an audience of truckers last week.Other administration officials and House Speaker Paul Ryan, R-Wis., have also claimed that their primary objective in reconfiguring the tax code is to help the middle class, not the wealthy.Unfortunately, they seem to have gotten things backward.In a preliminary analysis, the nonparti