Pethaps the Inevitable social ostracization & purging of certain unwanted types. It's already here and has very little to do with Christ or the Gospel - except for His name. Making it increasingly hard to understand salvation. For openers?
Indeed, the tenets of salvation and judgment are the domain of the Church - not political ideals or nationalism.
The Church is God's nation and it resides within almost every border and political dominion. Just saying.
It doesn't seem like a huge leap to get from "Jesus would vote for (my party) because...." to "you can't be a Christian if you vote for (other party)". Because, you know, since it's obvious Jesus would vote the same way I do you can't be Christlike unless you also vote the same way I do. Because, well, obviously.