Of more concern for Harper..should be the split in the right vote currently underway in Alberta's provincial election.
On the Federal level that's the split between the Liberals and the Conservatives. In places where the NDP wins, is likely to win, or has won the opposition tends to coalesce around the Liberals / Conservatives, or a hybrid. At which point the Liberals stop being a party who even give lip service to the left. This neatly mirrors what happens in most of the rest of the Western world. The bread and butter of the Federal Liberals for the last 20 years has been 'Talks Left walks Right'. The left stopped buying and stopped being afraid. A Liberal party that is centre right on economics and has nothing left to say on social issues is actually a party of the centre right that just happens to be left of the Conservatives.
The Liberals best hope is convincing Canadians that Rob Ford, spooky Tim, and the Critters in Harper's basement are the 'True Conservatives' and trying to pick up the Stintz type small 'c' conservatives.