The necessity of strategic voting

If we had a better electoral system, then strategic voting would be less important.
But we don't. So if you're a New Democrat or Liberal in Saanich-Gulf Islands, and you don't want to be represented by Green candidate Elizabeth May, then you need to vote for Conservative Gary Lunn.
If you don't want a Conservative majority, then you need to vote for May.
The race is close enough that neither of the two are assured of victory. Liberals and New Democrats with a strong preference have to rethink their choice.
The same is true in Esquimalt-Juan de Fuca, although the choices are different. A poll on the Project Democracy website puts Conservative Troy DeSouza at 40 per cent support, New Democrat Randall Garrison at 35 per cent, Liberal Lillian Szpak at 15 per cent and Green Shaunna Salsman at 10 per cent.
So Green and Liberal voters who would prefer a Conservative MP over a New Democrat, or favour a Harper majority, should likely vote Conservative. Greens and Liberals who are worried about the possibility of an NDP-led official opposition should vote for for DeSouza.
It's a inexact business - who knows how accurate the projections are. But it's what we've got.

There's useful information on strategic voting, particularly in B.C., here.