Dan Lederman, who defeated incumbent Pam Roberts in the election for chair of the South Dakota Republican Party central committee, was registered to vote as a Democrat in Iowa.
Republican former legislator Lora Hubbel provided Lederman’s Iowa registration to South Dakota reporters Wednesday.
The registration record shows Daniel Isaac Lederman last voted in Iowa in 2000.
Lederman later served in the South Dakota Legislature as a Republican from Dakota Dunes.
He was a House of Representatives member for the 2009-2010 term. He was in the Senate for nearly five years, serving from 2011 through the end of the 2015 session.
Lederman won the South Dakota Republican chairmanship this year.
Hubbel is one of four Republicans who have filed paperwork for the 2018 Republican nomination for governor.