Precedent

From the Star:

"...Dimitri Soudas, a spokesperson for Prime Minister Stephen Harper, sent out a
mass-distributed email yesterday drawing attention to the Liberals' rebuff of
Dhalla's bill. "They are voting against the (private member's bill) of MP Ruby
Dhalla! Their own bill!" Soudas's email said."

There you have it. The PMO's official view is that Private Members' Bills constitute party policy.

Then the same must apply for any "knuckle-dragger" on the other side, right?

This is gonna make for some fun research.