Not being muzzled at all.
Being disciplined, which is what Harper brought to the party when he took over, and what MPs were ready to buy into, given their experiences up until then.
We live in the age of the 9 second sound bite, context be damned. And an MSM that will descend upon a misstep like hyenas on a carcass.
I recall, like it was yesterday, Harper's comment about a culture of defeatism having been created in Atlantic Canada by Liberal policies...which, BTW, was spot on. Quite literally within minutes, a CBC reporter was on the streets of Halifax telling people that Harper said they were "defeatists", and what did they think of that? No context whatsoever, no preamble, zilch. They had a chance to create a trumped up unowhat storm around Harper, and they went for it for all they were worth.
Journalistic integrity? Means nothing!
In the early days, one CA MP from Saskatchewan beaked off...totally outside of party policy...regarding some Christian view of homosexuality or whatever, and of course, the MSM had a field day with it. The next caucus meeting, so the story goes, Harper came pretty much unglued...paint peeling off the walls, as one unnamed MP reportedly put it...and that Sask MP didn't show up in the next election.
Harper is a team player, no time for renegades inflicting themselves and their untoward views outside of official policy on the rest of party, full stop.
That's pretty consistent with most successful political leaders.