Jack2894 writes: "Dont' ask guys like this what went wrong. If they knew it wouldnt' have happened! If you want to know why you lost, then you need to ask your oppononents how they beat you."
I hate to say it, but you're right. The real reasons Republicans lost can be found by actually learning from the other side (not just objective analysis, but true engagement with them in order to learn) what they did right, and which forces and trends within society helped them. What Republicans did wrong is very obvious to those on the left, so Republicans will find better answers in that camp than by any internal hand-wringing analyses. Other people can see you far better than you can see yourself. :-)