First, David Emerson crosses the floor, then Stephen Harper appoints a Senator without an election.
Now, I personally don't think either of these are especially big deals. I've always thought the whole hullabaloo over floor-crossing was irrelevant. The Senate appointment is a bit more important (or less unimportant, if you will) simply because it's hard to argue that this was at all urgent - we could have held a sham election in a few months, and the Parliament would really have kept on ticking.
I don't personally think either the Minister of International Trade or the new Senator from Montreal need to stand for election, but if the Conservatives want to hold elections anyway, I say go for it.