Checking what GOP candidates that are running for presidency in the US in 2016, I can't help but notice that there aren't yet any "big name" candidates with serious credibility as a GOP candidate. I'm not an American, but it's saying something that I actually prefer Donald Trump just for comedic value. A lot of the rest just doesn't seem all that credible. from what I can tell, there are like 20 or 30 candidates, and many of them are tea party (too right-wing), overly religious for the more progressive members, too many opinions that are unacceptable to certain groups, or too progressive for the conservative groups.
Is there any GOP candidate who is enough of a central candidate to actually stand a chance against the democrat candidate?