Tim Cahill walked the walk this past week when he backed up his public claims of innocence with testimony - under oath - at his public corruption trial. It distinguished Cahill from former House Speaker Salvatore F. DiMasi, who declared his innocence but never testified on his own behalf before being convicted of public corruption in 2011. Meanwhile, UMass has kicked off an ad series featuring a prominent former politician often mentioned as a possible US Senate candidate.
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