Of all the Senate win and loss combinations to change party control of that body, the Agriculture Committee plays a key role with five of its members retiring at the end of 2014.Five members of the Senate Agriculture Committee are retiring at the end of 2014 including two who served as the committee chairman and one as USDA secretary. They are noted below:Following is a summary of each state's November race:South Dakota/Johnson: This is a four-way race. Rick Weiland is the Democratic candidate and was a staffer for former Senator Tom Daschle and was a state director of the Federal Emergency Management Agency (FEMA). There are also two independent candidates, State Senator Gordon Howie who is running as a Tea Party candidate and former Senat...