From the Conservative Party’s very own website, a three week old press release:

OTTAWA – Yesterday, Paul Martin repeated his mistaken assertion that he has never broken an electoral promise. The claim is simply incredible. In truth, Paul Martin and the Liberal Party have repeatedly broken promises on some of their flagship initiatives. What follows is an extended version of “Reality Check” highlighting some of the most memorable broken promises of the past
eighteen months.

Paul Martin on broken promises:
“I would never stay in office if I did not keep my promises,” he said (The Record, June 2, 2004).
“A government that does not keep its promises is a government that does not have the moral authority to govern” (Toronto Star, December 16, 2005).

Promises Paul Martin has broken since the 2004 Election:

18. Mr. Martin talked about reforming the Senate, but went ahead and appointed Senators the same old way, including disgraced former Liberal cabinet minister Art Eggleton, Liberal organizers like Jim Cowan, and Mr. Martin’s close friends Francis Fox and Dennis Dawson.