Though he personally did not commit the criminal acts, it was his judgement of character to have hired whomever was responsible for this:

"A review by The Detroit News of the petition signatures found full copies of a sheet of signatures that were photocopied once and in some cases two times and mixed in with the 136-page stack of signatures. In some cases, a different petition circulator's name was signed to the duplicate copy.

The overt copying is "frankly unheard of," said Chris Thomas, Michigan's director of elections, as he thumbed through the stack of petitions. "It's amazing when you sit and look, and it starts to dwell on you what they've done."

It will be an interesting thing to watch as McCotter takes an underdog position as a write-in candidate while simultaneously fighting the fallout commentary from this affair.  It will also be interesting to see if the MIGOP adopts its usual support-the-incumbent position, things being what they are.