Scott:  I am sure that BRO will answer helpfully.  I want to refer you as well to two comments I posted this evening in the thread under the article "Trump's pledge to Catholics."  I was addressing the case of two clerics -- a deacon and a priest -- who separately endorsed Trump.  They apparently went even further than the priest you describe, who seems to have posted a denunciation of Clinton without explicitly endorsing Trump (although it would appear to be a fair inference that your guy will vote for Trump and wants his readers to do the same.)  I think that's a very inappropriate thing for a cleric to do for reasons I posted in the other thread.