There are two basic segments of the institutional (what an appropriate word) Repig party: (1) the Plutocracy with their Randian Social Darwinists and (2) the inbred bigot/religulously insane - dominionist/bagger/caveman contingent. The plutocrats have the money but the lunatics have the numbers.
Originally this marriage of convenience was arranged by Ronnie Raygun, but the plutocrats have been getting greedier and the lunatics crazier every year. There isn't enough duct tape in the world to stick this mess back together again.
These two groups psychopaths are driving the Repig klown kar over the cliff, yet have in many ways nothing in common. The plutocracy's only real interest is in swindling every dollar out of the middle class after which the vampire squids will start turning on each other. The lunatics' only real interest is in returning to the Dark Ages. Oil and water, anyone?
Furthermore, demographics are turning, and brutally, against the Repigs. Within one or two more presidential election cycles it may well be basically impossible for them to manufacture an electoral college majority.
Let the circular firing squads commence now. The carnage will be a beautiful thing to see.