Other "non-profit, tax-exempt organizations as well have no problem with endorsing liberal candidates: NEA, Planned Parenthood, et al.
It is only when conservstive congregations and pastors come out favoring pro-life, pro-family, pro-faith messages from the bible, face IRS "investigations" (some might refer to them as "inquisitions") from the secular, leftist, hate-mongering "IRS".
And then only when "congressional or private citizens" report them and have the strong arm of the (in)Justice Department come after them.
The power to tax is the power to destroy.