Conservative Leader Pierre Poilievre spent much of the first week of this election campaign targeting NDP-held ridings that could be up for grabs now that polls suggest New Democrat support is in free fall — but the recent Liberal surge has upended those plans.

The big political story of the campaign so far is the remarkable resurgence of the Liberal Party — which only weeks ago was thought left for dead — as some voters sour on Poilievre after he led in the polls by huge margins for the better …