WASHINGTON, D.C. (CBSNEWS.COM) — More Americans than ever are likely to cast a ballot by mail for the first time in this year’s presidential election, and though this sounds like it should be simple, voters could face a learning curve in completing it properly and ensuring it arrives in time to be counted.

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In the primary elections held during the pandemic this year in five key battleground states, rejection rates of returned absentee and mail-in ballots ranged from a little under 1% to nearly 2%, according to a CBS News analysis of state data and a report from the MIT Election Data and Science Lab.

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