More than 10,000 absentee ballot envelopes sent to voters by the Board of Elections in the nation's capital did not feature a reminder to include stamps.
The envelopes usually have an "additional postage required" box for stamps, but the lack of a reminder is causing confusion, The Washington Post reports.
Board spokeswoman Rachel Coll says the reminder box wasn't included on the sample envelope that was submitted to a printer, and the agency can't reprint envelopes before Election Day.
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The U.S. Postal Service says it will deliver ballots with insufficient postage and just charge the local elections agency. Postage for an absentee ballot is a single Forever stamp, and the ballots also can be dropped off at the Board of Elections' office.