House Speaker Rod Jetton’s former Chief of Staff is set to announce, on Monday, that he is running for the Senate seat being vacated by State Senator Chris Koster (D-Harrisonville), who is running for the Democratic nomination for Attorney General.

Chris Benjamin is running as a Democrat. A press release says Benjamin will be joined by Koster and former Senator Harold Caskey (D-Butler) during a kick-off tour that will start in Warrrensburg before moving onto Harrisonville and Butler before wrapping up in Nevada.