Republicans fall mostly into three groups and those in the vicinity: One segment has a moral imagination limited mainly to matters involving sex.
A second group either wants to grant big business as much power to run the country as possible or is willing to aid and abet or at least not hinder this effort.
Finally, there are a few more moderate folks who just want change to go slow and not upset things much in a short time.
By the time you combine these allow for those in the vicinity of these three subdivisions and for some exceptions to any rules, you have included nearly all of them. But start with the three main groups and add as necessary.
You could also start with history, region, and culture and arrive basically at the same trio of barriers to what I would prefer in the way of a country worthy to elicit pride.
Mail me a letter attached to a 2010 Prius, and I will provide political science and journalistic labels for these denominations of barriers to progress.