link, Atlantic: pastors endorsing a presidential candidate (even though to formally do so "should" cost 501(c)3 status for a church).

http://www.theatlantic.com/politics/archive/2016/08/black-pastors-pulpit-hillary-clinton/494876/
It's not as though American pastors haven't had a history across the red and blue divides of endorsing candidates, but technically doing that is something the IRS "could" revoke 501(c)3 status for even if some pastors choose to endorse political candidates as pastors rather than individuals.