"Fed appeals court panel says most Obamacare subsidies illegal"

[Remster 24]

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Now it's up to the Supremes.

My understanding is, if that circuit agrees to take on the case as a whole, its past previous decisions are voided until their new ruling comes out.

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[Andy9o8 0]

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Now it's up to the Supremes.

My understanding is, if that circuit agrees to take on the case as a whole, its past previous decisions are voided until their new ruling comes out.

Yep, that's correct.

[Remster 24]

And hence, the supreme may not have to get involved (until whomever appeals the next decision).

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[Andy9o8 0]

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And hence, the supreme may not have to get involved (until whomever appeals the next decision).

That's partly correct. If the 2 circuit appeal courts ultimately rule the same way, the Supreme Court does automatically have to get involved, since there would be no tie to break.
That said, in this case, given what's at stake, I'd expect whomever ultimately loses in each circuit to appeal to the Supreme Court; and although the Supreme Court can either agree or decline to hear the appeal(s), on an issue of this importance I'd predict the S.C. will agree to hear the appeal.