In all actuality, few political issues are truly spiritual issues. As an example, we may prefer lower taxes, but the Bible
does not endorse low taxes; all it says is that we are to pay our taxes honestly (Romans 13:6-7; Matthew 22:15-21). Taxes and many other issues (social security, universal healthcare, education funding, prescription drugs, etc.) are not spiritual issues the Bible specifically addresses. As a result, Christians can in good conscience have disagreements on these issues.