We can see that the only read way to have a lasting impact on our world is through the Church. By being the Church - practicing the peculiar ethic Christ demonstrated for us, and enables us unto - we achieve much more than by competing for the opportunity to manipulate the political mechanism. Christians have all sorts of ideas on issues, but when we approach Christ, we find that there is but one ethic, one model to emulate.
We can take different positions on what the government should do, because the government is outside the church. It is not a part of Christ's ethic. It is not our means to achieving His commands. The Church is. When He commands us to love our neighbor, He does not say to do this by paying our taxes and politicking for wealth redistribution to the poor. No, He commands us to personally care for our neighbor. There is no room for an "I gave at the office - I paid my taxes" attitude amongst those who are spiritually renewed. Neither is there room for believers to demand charity of unbelievers. How can they love if they have not accepted the love of Christ? They are spiritually dead. Any "good works" they perform are out of guilt or alternative motivation. It is not for them to love their neighbor, and it is not for us to command them to. It is our responsibility, only.