Obviously you've never heard of Ronald Reagan and how he won by huge landslides because he was smart enough to appeal to the vast majority of Conservatives regardless their party.
But why let a little history get in the way of a perfectly good fantasy eh?
Add to this the opportunities for fraud presented by the presence of millions of undocumented illegals and the absence of enforceable ID requirements in many states, MSM acting as the publicity arm of the Dem Party, as well as the intimidation, chicanery and outright election theft at which Dems are much more accomplished, and the organizational advantages being built by 0, and I believe that Republicans will always face an uphill struggle on the national level in the future -- even if they somehow manage to get their act together. In fact, I'll gladly buy you dinner at a restaurant of your choosing if a Republican ever again wins a presidential election by anything close to Reaganesque landslides.