South Carolina will hold elections in November 2014 for both its U.S. Senate seats. The new American Party, which qualified earlier this year, and which is a centrist party, will have a candidate for the short term U.S. Senate race. She is Jill Bossi, vice-president of the Red Cross in South Carolina. See this story.
Centrist parties that are organized in just a single state, other than Americans Elect, are on the ballot in Connecticut, Delaware, Florida, Hawaii, Minnesota, New York, Oregon, Rhode Island, and South Carolina. Also, the United Independent Party is petitioning in Massachusetts. Thanks to Scott West for the link.