Just speculation from one of my anonymice, but fascinating nonetheless now that Prince Albert Conservative MP Brian Fitzpatrick has decided not to run in the next federal election:
A replacement candidate for the Tories? Cry baby Jeremy Harrison.... If Jeremy chooses to give up his high paying consulting job to [run for] Harper.
A Liberal opponent in this riding? David Orchard. You heard it here first.
Diefenbaker's old riding has flipped back and forth between the three major parties for the past half-century. A prominent, relatively conservative Liberal like Orchard would probably have a good chance in an open seat.