Georgia State Senator Chip Rogers was re-elected unanimously on November 6 in district 21, but yesterday he resigned from the State Senate. Therefore, a special election will be held to fill the vacancy on January 8, 2013. Qualifying runs from December 10 to noon on December 12. Anyone can run with no petition; the only ballot access requirement is to pay a filing fee of $400. If no one gets at least 50% in January, a run-off will be held on February 5. See this story.
Sean Jerguson, one of the candidates in the special state senate race, was unanimously re-elected to the House on November 6. He had represented House district 21 (it is just a coincidence that both empty districts happen to be numbered district 21). He is forced to resign from his House seat in order to run in the Senate election, so his seat will also be vacant, and it will also be filled on January 8.