Senate Democrats who fret over the distributional effects of tax cuts should thank their GOP colleagues for giving them the chance this week to vote on repealing one of the most regressive taxes: the Obamacare tax on the uninsured.

This tax disproportionately falls on those with incomes less than $50,000, while exempting many households earning six-figure salaries. Many who qualify for subsidies will have to choose between paying the tax and buying policies that offer shabby coverage with onerous deductibles that could stick them with big medical bills.

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