Should churches be able to endorse candidates and still be tax exempt?

A fundamental social duty of the church is to balance the government. Religion is essential as a moderating force in society- another checks and balances system. Because of this, and the fact that politics inherently affects religion and churches, I think that yes, they should be allowed to endorse canditates. This is not mixing religion and politics in a bad way, as the church still isn't making the laws. The government should not be able to say that what a church can or cannot preach/endorse- that is the purpose of "separation of church and state"