Well, this link has Harper's own words while talking to Peter Mansbridge on the CBC.

Peter Mansbridge: Next question is coming from a city you're very familiar with, from Calgary. Colleen Belisle: Hello, my name is Colleen Belisle and I have a question for Stephen Harper regarding the accountability issue. In the past 18 months, I have noticed a number of MPs crossing the floor after the election. This makes me wonder why I should, as a voter, go and vote when my MP can change parties after the election. Mr. Harper, are there any policies that you plan to enforce after the election regarding this issue? Thank you. Stephen Harper: My short answer is no. And I understand the voters' frustration. You can imagine I feel that frustration as much as anyone. I was the victim of a number of the particular incidents that the voter is referring to, that Colleen's referring to, but the difficulty, Peter – I know that many members of Parliament have put forward various proposals that would restrict the right of MPs to cross the floor, force elections, or whatever. I haven't seen one yet that convinces me that it would create anything other than a situation where party leaders have even more power over the individual members of Parliament. And, as you know, I've said that, of course, I've said that for a long time that I think our members of Parliament need more authority, need to be able to represent their constituents' views, and they may make very bad decisions in crossing from a good party to a bad party or, more particularly, a winning party to a losing party. But that all said, I haven't seen one yet that I'm convinced creates a bigger problem than it's actually trying to fix. Peter Mansbridge: Do you think voters are as uncomfortable as Ms. Belisle points out when these kinds of things happen? Because if they are, one assumes that they are looking for direction from their political leaders to prevent this from happening. As you pointed out, some parties, the NDP has said it would force an immediate election. Do you think something has to be done? Stephen Harper: Let me give a concrete example of an alternative situation. The Conservative Party of Canada, the new Conservative Party was created because people left actually no less than three separate old caucuses, two old parties, and joined with a new party, and I think there is widespread consensus among not just members of the old parties, but members of the public as well that this was a good thing to create a stronger opposition, to end the fragmentation of the conservative movement in the country. Now, you know, this kind of law could have forced us into a situation where we were having 75 byelections. So, you know, that's a problem with any of these proposals. We understand, I understand why people want them, and, believe me, there's a couple of cases that have happened where I'd love to have a law like this, but there's also a lot of downsides when you think it through. As I say, in a practical matter, I could see how party leaders could really abuse that particular provision to make it even more difficult for members who may disagree legitimately with their party to operate within the party.

(emphasis mine)

That should silence those who feel Harper went back on his promises regarding democratic reform. Did we, as Conservatives, have a right to be upset when Belinda crossed? Yes. But it was because we feel betrayed, not because we feel crossing the floor should be outlawed.

Our system is designed to vote for a candidate, not by party lines. As I pointed out here a party can be more popular than a candidate, but that is now how our electoral system is built. We elect an MP, not a leader and not a party.