He's probably unelectable thanks to some stupid moves he's made -- he voted against the Violence Against Women Act.
Walker is still in his first term and he dropped out of college, which is a big negative (in my view). He was only one semester short of a degree, but he's never bothered to finish? Something's not quite right there.
Christy is a corrupt New Jersey politician.
What makes you think these people are unelectable based on these factors? I think you're vastly overestimating the competence of Republican voters.
My prediction is that we're going to have a Republican president elected in 2016, and it'll be Jeb Bush. He's going to run against Hillary Clinton. After Obama disillusioning the progressives and blacks, turnout on the Democrat side is going to be weak because no one except middle-aged and up white women are excited about Clinton. Bush is going to win the Republican nomination somehow. Bush speaks fluent Spanish and is married to a Mexican-American woman. Republican voters are going to vote for him just because he's Republican, and the Latinos are all going to vote for him too because of the above factors, and because he'll appeal to their religious sensibilities with his anti-abortion rhetoric, plus his positive views on immigration reform.