An unconventionally split Supreme Court heard arguments Wednesday over a Republican appeal to determine whether legislators have the power to set federal voting rules without the oversight from state courts, a consequential question that could drastically change the landscape of future elections. The 6-3 majority of Republican-appointed justices raised difficult questions about the arguments presented by the counsel for North Carolina's Republican lawmakers, who are essentially asking to remove the power of state courts to strike down legislature-drawn congressional districts following the state Supreme Court ruling the lawmakers illegally gerrymandered. A broad ruling favoring the Republican lawmakers' argument could require...