In conducting a special election held under this subsection to fill a vacancy in its representation, the State shall ensure to the greatest extent practicable (including through the use of electronic means) that absentee ballots for the election are transmitted to absent uniformed services voters and overseas voters (as such terms are defined in the Uniformed and Overseas Citizens Absentee Voting Act [
42 U.S.C.
1973ff et seq.]) not later than 15 days after the Speaker of the House of Representatives announces that the vacancy exists.