I’m perplexed and puzzled by so much of Republican Donald J. Trump’s nomination for the presidency of the United States.

Perhaps no set of issues baffles me more than Trump’s ability to make morality an issue to use against his opponent, Democratic nominee Hillary Rodham Clinton.

Trump has gleefully told us that Bill Clinton’s misbehavior while he was president is relevant in this campaign. He questions why Hillary Clinton has stayed with him. He asserts some sort of moral authority that, to my way of thinking, he simply does not possess.

Trump is now married to his third wife. His first two marriages ended in divorce.

While his first marriage was ending, Trump actually boasted out loud and in public about his sexual infidelity. He has bragged about his extramarital sexual conquests.

I cannot help but think of these things when this guy campaigns for the presidency of the United States and throws out canards about a previous president’s misbehavior.

Someone needs to help me understand: How does this guy get away with this kind of duplicity?

Seriously. Can someone out there explain it me?