CBC's The Current has a list of cabinet ministers who have declined and accepted requests to participate.
Here are the top four refusniks. Which is the refusiest?
Guess first, check the link after.
Vic (The Adulterer) Toews
Jim (I'm Outta Here) Prentice
Lawrence (The Loose) Cannon
Peter (Crybaby but in a Macho Uniform-Wearing Kinda Way) MacKay
Follow-up question: Are they more scared of Anna Maria Tremonti or The Voice? I've met The Voice. Definitely scarier.