Overall we are a centrist nation. There are hardcore fundies on both the left and the right. The sweet spot is when you can capture that 40% or so in the middle. If you swing too far one way, the pendulum will swing back hard in the other. The middle-right, in which I would place McCain, will hopefully reject the calls from the far-right. The American people are not stupid. When we (Americans) start hearing things like, "Jesus is punishing America for its stand on abortion!" we know to head to the other side of the stage.
McCain had an uphill battle from the start. He was an old man running up against new ideas. If Biden had been the nominee instead, who knows how the race would have turned out. It was also unfortunate that McCain had to pander to the base instead of running a more moderate campaign. The same thing happened to Dole back in the 90's. Both men are statesmen who would do right for the country. I think that the Republican base is a little more entrenched than the Democratic. There are more of those "True Believers" that somehow this country is being looked over by God himself. Kinda scary. Just like Allah is watching over Iraq/Iran/Syria. We all know the problem of bringing religion like this into politics. Because now any action we take is blessed by GOD! How can we be wrong? We're following HIS will! So yeah, I hope this country can stay in the middle of the teeter-totter. It's a challenge, but the net result is hopefully good balance.