The CBS station in Boston is reporting that Massachusetts Governor Deval Patrick has selected William "Mo" Cowan to occupy Senator John Kerry's seat once Kerry is sworn in as Secretary of State today:
BREAKING: Gov. Patrick to name Mo Cowan interim senator. Details coming on WBZ-TV & cbsboston.com— Jon Keller (@kelleratlarge) January 30, 2013
Cowan served as Deval Patrick's chief of staff and had been planning to step down from that position this month. He'll step down from the interim Senate appointment after a special election in June.