WASHINGTON — The Supreme Court on Wednesday upheld North Carolina’s new voting law, which cuts back on early voting and eliminates same-day registration.

The ruling affects North Carolina, scene of a tight Senate race that could help decide which party wins control of that chamber for the final two years of President Obama’s term.

The justices reversed a federal appeals court’s decision that would have allowed same-day registration and counted votes cast mistakenly in the wrong precincts. Those were among several other procedures eliminated by the state Legislature last year.

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