My understanding is the percentage of the white population in the US is decreasing every year and will bottom out at around 30 percent by 2050. If this is so, the Republicans need to get really busy fast increasing the white vote to around 65 percent or more rather than the 59 percent Romney got. Blacks voted 95 percent and Hispanics voted about 70-75 percent for Obama.
Republicans will never get a substantial black vote. So they need to decide whether they will chase the Hispanic vote or appeal much more directly to a white identity of sorts and embrace the idea that the Republican party is the "white party."
I don't think the Republicans can get enough hispanic votes. Every year, more unskilled hispanics immigrate to the US, and many go on welfare and, later, will receive Obamacare. The more "upstanding" hispanics demand amnesty for illegals, open borders, and more and more immigration from latin countries. What can the Republicans realistically offer these people?
The only option is for the Republicans to focus on their natural white constituency, which is still the largest voting block in the US.
It will take a really talented candidate to grow the white vote, define and appeal to white interests, and deflect the inevitable charges of racism by the media. What is the alternative?