The former Calgary mayor is beloved by many in the province. He might well be the favourite in the race to succeed Rachel Notley as leader of the Alberta NDP. But he's never really been involved with the party, and his trademark 'purple' comes from blending Liberal red and Conservative blue. No orange in sight.But his campaign will force some fascinating questions onto the party, both in Alberta and nationally. Questions that have been bubbling just below the surface for the past couple of elections, and are making insiders wonder about the future of a unified national NDP... GUEST: Graham Thomson, Alberta-based political analyst