I assert that state courts have power which is only limited by the following four things:
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A limitation on their power by the enabling document (usually constitution) of the state;
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A limitation on their power by a legal law of the state;
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A limitation on their power from the English Common Law;
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A limitation on their power expressly established by the United States Constitution.
Note that the final arbiter of 1, 2 and 3 is the “supreme” court of the state in question.
So, in the absence of 1, 2, 3, or 4, yes, the court would have exactly that power.
This question usually comes about at a lower level, when some enterprising judge decides to fashion some unusual remedy for a case in front of them. Everyone who sees it, or hears/reads about it questions whether the judge has the power to do that (including, often, the person to whom the order is addressed). Quite often, the response is, “Yes, yes they can do that.”
So let’s apply this concept to the case at hand. The League of Women’s Voters has filed suit, claiming inter alia that the Congressional districts created in 2011 were violative of Pennsylvania’s Constitution. The case has worked its way up to that states ultimate court. That court has made a decision in favor of the complainants, and fashioned a remedy to which the respondents object (namely, that the respondents should re-district the state following the law, and, if they can’t/won’t do so in the limited time offered to them, the Court will do it for them). The question is whether the Court is allowed under the Constitution of the United States to make that order. Clearly, the part of the order which is debatable is the assertion by the Court that they will do the re-districting themselves, if need be.
(As an aside, I will note that the Legislature had the full power to avoid this, simply by re-districting the state in the time allotted, but they intentionally refused to do so. That, to me, is an indication that their complaint about the rest of the remedy should be viewed with skepticism, but I digress…)
The only Constitutional claim worth worrying about is that the Constitution of the United States specifically delegates to the Legislature of a state the drawing of its districts for congress. “The Times, Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof;…” The assertion being made is that this language specifically prohibits the courts in Pennsylvania from fashioning a remedy that includes re-drawn districts. The response (initially) is that the Pennsylvania Legislature has established courts with the authority to do this on be half of the Legislature (impliedly) as part of their judicial authority*. That the courts can fashion districts is an accepted power of courts; there have been numerous instances of both federal and state courts doing so in response to claims of illegal/unconstitutional boundary-drawing. In those cases in the case of state districts, one presumes, the drawing of the boundaries was delegated to the legislatures, much as drawing congressional boundaries is delegated to them by the US Constitution. So we have the already accepted principle in place: judicial district drawing is not precluded simply because the enabling document directs the legislature to do the drawing.
And it’s imperative that this be true. Let us assume, arguendo, that your assertion is true: the Court cannot fashion its own districts. Then what would the remedy for this wrong be? The Pennsylvania Legislature, controlled by Republicans, could refuse to re-draw the districts. The court, in the absence of being able to re-draw the boundaries, would have no appropriate remedy. They cannot use the current districts; those are unconstitutional. They cannot let the current office-holders stay in office; they are unconstitutionally chosen (and besides, the court by the same principle could not extend the terms of these people, since those are set by the Constitution of the US, and by the law established by the state Legislature). In short, your principle, taken to logical conclusion, establishes that the Legislature of a state would have zero check on its power to draw the districts, beyond the eventual possibility of being voted out of office at some future point in time.
Under the circumstances, and in the absence of judicial authority in favor of the limitation you would place on the state courts, I would assert that they do, indeed, have the power to do this.
Now, if you want to question their competency to do this (Political Questions for $100, Alex!), you might find some fertile fruit. After all, what happens if the Legislature and the Administration simply refuse to use the re-drawn districts?