An Interesting idea via City Lab https://www.citylab.com/politics/2017/04/america-needs-a-metropolitan-party/523065/
While the political divide does seem to be city vs rural so maybe the idea is to capture more of the suburban mind set. But I see just one problem, few seem to be doing the metropolitan area as a economic engine well. We are on the cutting edge of a lot of new concepts like complete streets which seem to be taken as a war on cars when really they are trying to get the streets to work well for everyone, including cars. Basically every thing we should be doing is fought tooth and nail because it does not continue old fashion ideals that the car is king so everyone should get a car. And that's just one issue that needs to be settled before a metropolitan party could become main stream.