Article updated: 1/30/2013 9:36 AM

Mass. gov. picks ex-aide Cowan as interim senator

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William "Mo" Cowan, right, former chief of staff for Gov. Deval Patrick. On Wednesday, Jan. 30 2013, Patrick will appoint Cowan as interim senator to fill our the term for John Kerry.

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Gov. Deval Patrick has named his former chief-of-staff William "Mo" Cowan to serve as interim U.S. senator for Massachusetts until a special election can be held this summer to fill the seat left vacant by John Kerry's confirmation as the nation's new secretary of state.