Romney-Clinton voters are more likely to live in a suburb, especially in the Sun Belt. They tend to be socially center-left and fiscally center-right, while Obama-Trump voters tend to be socially conservative and fiscally liberal, and more likely to live in the North. Obama-Trump voters to tend to make less money are less educated, are more likely to male, and less likely to live in a city or suburb than Romney-Clinton voters.
This; GregTheGreat657's description is completely accurate and very detailed.
I mean the GOP today is definitely more libertarian on social issues than it was 10 years ago especially on issues like LGBT rights ,the Drug War, and dont emphasize religion nearly as much . The GOP of 2004 and even 2012 keep in mind was very socially conservative in the tradional sense of being : Very religious, super tough on crime, and generally believed in promoting traditional values.
The Trumpist GOP is more socially conservative in the nationalist sense while many religious people in a way were not.