Workers sort through mail-in ballots in Reading, PA.
Ben Hasty/MediaNews Group via Getty ImagesUp to 70% of vote this November could be cast by mail. But not all states will allow it.
And a recent NPR survey found that 65,000 absentee or mail-in ballots have been rejected this year for being late.
NPR's Mary Louise Kelly visited a county in Pennsylvania to see what challenges lay ahead for election night in a critical swing state.
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This episode was produced by Brianna Scott, Lee Hale and Brent Baughman. It was edited by Sami Yenigun and Beth Donovan with fact-checking from Anne Li. Our executive producer is Cara Tallo.