Which party's electoral/demographic coalition is more unstable?

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The Republicans have the system working for them and the Democrats are stuck with the poor masses. The narratives have the Democrats as defenders of the meek and real champions of justice, so when they have to defend themselves to their constituents it becomes a little difficult to justify their corrupt, corporatist abuses of the American public. On the other side, the Republicans milk the money cow for all it's worth and carpet-bomb the ignorant masses with lies about it to the point that their lines become the truth in direct contrast to their prolific government profiteering.