Bost will have to resign his state House position early, before he is sworn in as a U.S. congressman on Jan. 6. The Murphysboro Republican toppled freshman Democratic U.S. Rep. Bill Enyart on Nov. 4.
http://thesouthern.com/news/local/govt-and-politics/bost-to-resign-early-from-state-house-heading-to-dc/article_2f11099b-bc1c-5d00-ab3b-8ac1234c0a60.html