I think that's basically true - there just seems to be a wider variety of Republican voters than Democratic voters, so a candidate seeking the support of all Re

I think that's basically true - there just seems to be a wider variety of Republican voters than Democratic voters, so a candidate seeking the support of all Republicans is invariably going to leave a large chunk of them out in the cold when it comes time to make realistic choices. This is also true for Democrats (isolationist vs interventionist is a big one) but there don't seem to be as many areas of huge cultural disagreement.