Riggs was replaced by long - time Democratic Assemblyman and State Senator Mike Thompson .
The GOP last held the seat in 1998 when U.S. Representative Frank Riggs decided to run for the U.S. Senate .
Representative was replaced by long - time Democratic Assemblyman and State Senator Mike Thompson .
The GOP last held the seat in 1998 when U.S. Representative Frank Riggs decided to run for the U.S. Senate .