Churches and religious organizations should refrain from becoming involved in politics because there should be a separation of church and state in general. This American ideal should mean churches deal with the spiritual sides of life rather than trying to affect public policy. When churches get involved in politics, a conflict of interest can ensue regarding conservative policies.
Churches should stay out of politics altogether. While a church may have a moral issue to discuss their beliefs on abortion or adultery, They do not have a right to tell their parish members how to vote. Religion has no place in politics. The government should also stay out of religion.
That phrase came from a letter written by Thomas Jefferson to the Danbury Baptist Association. They had heard a rumor that there was going to be a National Christian Denomination set up, and asked what would become of the other denominations, to which he replied that the rumor was untrue and that there would remain a "Wall of Separation between Church and State." This nation was founded upon the very precepts of Christianity!
As James Madison, the Father of the Constitution once said:
"We have staked the whole future of American civilization, not upon the power of government, far from it. We have staked the future of all of our political institutions... Upon the capacity of each and all of us to govern ourselves, to control ourselves, to sustain ourselves according to the Ten Commandments of God."
I rest my case.