I want to know how Republicans combat this stupidity, if that's possible at all.
You do realize how dumb voters were on both sides of the issue, right? I just want to be clear on that...
===
Nevertheless, Republicans have to reform, split, or die. There isn't any way around it. I am of the belief that the "Hyper-Reaganism" (coined by Sean Wilentz) that has dominated the GOP since 2000 will have to go away if they're going to bring back the votes of moderate Republicans and that extremely important middle 30% of Independents. Reform would be the easiest solution, but that means that a lot of Republicans (if they haven't already been pushed out) will have to change their position on some things dramatically. Simply put, the demographics of voters has changed, and the majority of the GOP does not cater to it.
Lets explain in simple terms why McCain-Palin lost...
The central
BLACK line measures the political view points and the number of votes available. Obviously, the majority of Americans tend to drift towards the center of the political spectrum, playing towards both sides of the field. The left
BLUE line represents what Obama had run on during the primary. Similarly, the right
RED line represents what McCain had run on. **NOTE** McCain's line is closer to the center, something that he has constantly done, being to the left of a large portion of the Republican party since the Reagan years.
The key is to move your political position closer to that gray center line in order to get the highest number of votes. Traditionally the United States operates as a right-of-center country, so in theory, this should have been in the bag for McCain if he would have stuck to his Republican-fighting principles. The teal line on the left demonstrates where Barack Obama moved in his position, slightly to the right, but still left of center. By comparison, McCain did what you're not supposed to do. Republicans were far too worried about catering to the "base," and consequently, McCain had to move his position further to the right... Something that alienates moderate Republicans, Independents and conservative Democrats. This is something that was repeated across the country.
I've heard arguments that the center gray line has moved further to the left based on the voting preferences of younger voters, and the needs of the middle-class being catered to better by the Democrats. That, or this is a political trend based on perceived need right now. I find it somewhat hard to believe completely, but understandably, if we are to follow what we call "Barkan's First Law of Politics" (ie, people die), the Republicans have not done enough to bring in youth and minority votes to keep their voter base big enough to offset that of the Democrats.
But in even more simple terms,
Omnis hit the nail on the head.