It seems like expat Americans need a political lobbying group to watch their interests. It would seem like large, international companies might have at least a passing interest too, as they might want at least some fraction of american staff to be posted internationally.
The two major political parties have organized themselves for citizens outside the United States but predictably they have other drums to beat. The D and R debates tend to be indistinguishable from the Itchy and Scratchy Show. The ACA is even-tempered and contains both D and R members.