A couple reasons why the republican party is dying:
If you look at the makeup of people in this party it is most white men, then older people and some white women.

The tide has turned in America and the white race is dying out because white people are not repopulating their race. People of color are breeding more than 1.8. Soon the white people are going to be the minority all over the country, not just in the southwest.

The republican party has become fundamentalist. Religion or lack thereof is not what a political party affiliation should be about, that is what churches are for, to support your religion. the republican party has strayed from the main concept of separation of church and state too far for most people's comfort.

The republican party has alienated women from the their party by trying to turn back the right of women to make their own decisions about reproduction.

Having people like karl rove co-opt the tea party movement certainly turned me off. It started off as a good movement, one that I supported, then it was hijacked by the neo-cons who pretty much got us into the mess we're in.

The way the republican party and the media was so rude to Dr. Paul, a long time conservative who was respected by many, was also a big turn off. We need more honest statesmen in our leadership like Dr. Paul.

I've been registered as a republian because it used to stand as the party that was fiscally conservative. It championed the environment. It was for limited government. I don't even recognize the party anymore. It's a sad state when the republican party can not muster up a viable candidate to beat Obama, twice.