FILE - This undated file photo released by the Massachusetts Governor's office 

FILE - This undated file photo released by the Massachusetts Governor's office shows 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, who was confirmed to be the next secretary of state Tuesday, Jan. 29, 2013.  (AP Photo/Massachusetts Governor's Office, File)
Associated Press
FILE - This undated file photo released by the Massachusetts Governor's office shows 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, who was confirmed to be the next secretary of state Tuesday, Jan. 29, 2013. (AP Photo/Massachusetts Governor's Office, File)
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