I'd be very surprised if the NDP and the Liberals ever join to form a single party. For one thing, it would require one of them giving up their own offical identity and being absorbed into the other. I see no chance of either of them being willing to do so.

The Liberals have always seen themselves as the natural governing party of Canada, and all others as mere upstarts.

The NDP have always seen themselves as a bold new alternative to the old entrenched big boys...the Liberals and Conservatives.

How do you get either one of them to swallow their pride and abandon their delusions of solitary grandeur?