Revelation 18:4-5 indicates that those who participate in an evil nation will be held accountable for its sins.
The Bible doesn't address the issue of democracy because Rome was an empire, not a democracy at the time. But government by the people means that if the government does something bad, the people share the guilt for it.
Paul could be a Roman citizen because citizenship of Rome was by birth and didn't imply participation or endorsement of the government, so long as he didn't condone or help enforce any policies of Caesar that went against God's commandments. The only people to blame for Caesar's evils were Caesar and his soldiers. But in America, a democratic republic, it's totally different--everyone who participates is partially to blame for everything the government does.
The authors of the New Testament certainly did not condone Caesar's government--many of them got killed by it!!
The Bible says clearly that we should not resist secular governments. But it says nothing to indicate that we should participate in them. Instead, it says the opposite: Give to Caesar what is Caesar's and to God what is God's! In other words, let the United States have its dollars. Don't even bother pursuing them in the first place--if Christians stopped voting and didn't use Federal Reserve Notes as currency, they wouldn't have to pay taxes (since the government can't take dollars from people who don't have dollars), and they wouldn't be participating in evil. Plus, non-Christians would stop being mad at Christians for using the government to force their morality on sinners, and it would be easier to witness to them.
Ultimately, what Jesus advocated most passionately was for us to love each other. If we take part in tyrannical governments and allow tyranny to exist on the earth, how can we claim to love our neighbors? All the bloodshed of modern history could have been prevented, if we would have obeyed God rather than men, like the Bible says. If only we would obey that commandment of love for each other, instead of making up our own stupid laws and putting each other in prison for breaking them and trying to force our opinions on each other...
So many atrocities in the world have been funded by US dollars. Most of the tyranny and socialism that the government claimed to oppose were financied by the American banks, which would never have been possible if it weren't for the Federal Reserve Act in 1913. Most people aren't aware of it because they don't study modern history (or get a perverted, false view of it from their establishment colleges and revisionist textbooks). It can't possibly be right to support evil!
The only solution for Christians is non-resistance and non-participation. We are not of the world--we are of the kingdom of God, and we are sent into the world only as ambassadors. The prince of the world is Satan, who has been given authority to do what he will but whose will is not righteous--anyone who follows him will be bound along with him during the millennium and judged along with him at the final judgment. It needs be that offences come, but woe to those by whom they come!
Few churches teach that people will be held accountable for how their actions impact the world; the church leaders WANT people to be worldly, to go out and get dollars so that they can bring them back to the church leaders, who then buy their prostitutes or mansions or whatever it is they do with church funds. The American church is involved in secular politics, not because Jesus said we should be, but merely because it is led by very evil men who have tremendous lust for power over others.
Jesus is going to come back literally to reign over the Earth as a king, and all the governments who oppose that kingdom will be struck down--those who don't accept Christ will be killed and fed to the birds (Revelation 19:17-21).
God's will is for us to seek first the kingdom of God and His righteousness. "All who are not with me are against me." Anytime we promote an alternate kingdom, we are being sinful because we are wasting the time we could be spending to promote the true kingdom, Christ's kingdom. James 4:4 says that friends of the world are enemies of God.
