The former Liberal Justice minister is a late-breaking candidate for the federal Liberal leadership. He lost to Tom Mulcair in Outremont in 2011 and did not contest the three elections before that, but back in the olden days Jean Chrétien handed him an increasing series of responsibilities. He was justice minister when Canada began to legalize gay marriage and almost decriminalized pot. He may be seen as an exciting candidate.
As Montreal journalist Justin Ling points out, a recent speech Cauchon gave in Berlin seems custom-designed to stifle any excitement.