The Supreme Court will hear oral arguments in the case of King v. Burwell, a suit seeking to stop billions in health care tax credits, on March 4, 2015.
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The Court first announced they would hear the case on November 7th, a surprise that many Obamacare supporters took as a bad sign for the law. University Law School professor Nicholas Bagley wrote at the time:

In a significant setback for the Obama administration, the Supreme Court just agreed to review King v. Burwell, the Fourth Circuit’s decision upholding an IRS rule extending tax credits to federally established exchanges.