Native American groups in North Dakota are scrambling to help members acquire new addresses, and new IDs, in the few weeks remaining before Election Day — the only way that some residents will be able to vote. This week, the Supreme Court declined to overturn North Dakota's controversial voter ID law, which requires residents to show identification with a current street address. A P.O. box does not qualify.Many Native American reservations, however, do not use physical street addresses. Native Americans are also overrepresented in the homeless population. As a result, Native residents often use P.O. boxes for their mailing addresses and may rely on tribal identification that doesn't list an address.Those IDs used to be accepted at polling places — including in this year's primary election — but will not be valid for the general election. And that decision became final less than a month before Election Day, after years of confusing court battles and alterations to the requirements.