This is exactly where I realize in an argument with my evangelical friends that they are not sincere in their view about politics and Christianity.
When it comes to Abortion and Gay marriage, my evangelical friend quote scripture and show their passionate faith in Biblical doctrine and how we Christian should try to influence government to ban abortion and gay marriage because that is what Bible teaches us, this is how we should practice Biblical teaching.
Few minutes later when conversation turn to immigration or healthcare for all or better welfare system for poor or free education for all , that very friend who was telling me that as Christian I should vote to influence Biblical teaching on government, starts telling me Government is not the place to practice Biblical principle. They will agree helping the poor, giving shelter to foreigner is Biblical, taking care of widow or sick is Biblical teaching but that is the job of Christian and Church, not the Government. By then they became steadfast defender of complete “separation of Church and State” .
In another word , they want some Biblical principle enforce by Government, other teaching they have reservation.