If Alberta were actually part of the US, it would probably be a lean Democratic state... something like Colorado but with a more urban population. I doubt Edmonton and Calgary would be good areas for socially conservative Republicans. But then again it's hard to know what Alberta would be like as a US state because surely it would have a very different set of people.
If analogous with America, then it would have to be Utah just based on voting patterns with a central city that every once in a while doesn't vote Republican.
I'm curious (this is obviously an unanswerable question, but I feel like posing it anyway)...considering the amount of influence a state of Alberta's size has on US politics, if Alberta joined the US, would the US tack left or would Alberta tack right?