Slow USPS delivery in Missouri could disenfranchise absentee voters in key senate battleground: report
Sen. Claire McCaskill (D-MO), via her office's official Flickr account.

Officials in Missouri are worried that absentee ballots may arrive after the polls close on Tuesday -- and thus not be counted -- the St. Louis Post-Dispatch reported Monday.

The Show Me State is home to a U.S. Senate race that may decide control of the body, with Sen. Claire McCaskill (D-MO) being challenged by Republican state Attorney General Josh Hawley.

"Both Republican Director Rick Stream and Democratic Director Eric Fey said mail delivery of the ballots to voters, and back to the board, has seemed slower this year," the Post-Dispatch reported.

Fey said USPS told the election board to expect delivery times between five and eleven days.