"Liberals talk about booming incomes at the top while lower-income households barely see benefits from economic growth. Conservatives talk about a rising share of the population that depends on government benefits and a shrinking share that pays income tax.

Though the frames are different, these are descriptions of the same economic phenomenon: rising inequality of pre-tax incomes.

But only liberals are advancing a semblance of an agenda to address it.

WORSE NEWS for Republicans: Josh Barro is a conservative.