My answer to How will Republicans maintain their grip on power given the changing demographics in the U.S.?
Answer by Abbey Laurel-Smith:
Through the use of the electoral college and re-mapping of districts in the red states with the south, Texas and Florida leading the way. Regardless of how well populated New York, New England and the state of California becomes, demographic changes alone will not be enough to tip the balance. Those Whites and Blacks (with five or four grandfathers) might eventually end up a minority, but they will use the power of voting blocks – as given by the constitution, to keep non-Republicans out and away from their hold on the House and the Senate. The office of the President, maybe.
I see them grabbing more seats in the Senate and the House (than they have now) in the next series of elections.