Never apologize for or otherwise undercut the argument you've made or leave your readers with the sense that "this is just little ol' me talking." Leave your readers with the sense that they've been in the company of someone who knows what he or she is doing. Also, if you promised in the introduction that you were going to cover four points and you covered only two (because you couldn't find enough information or you took too long with the first two or you got tired), don't try to cram those last two points into your final paragraph. The "rush job" will be all too apparent. Instead, revise your introduction or take the time to do justice to these other points.
Trump has leveraged the gun issue to his benefit. When it comes to campaigning, he's a natural. He has a sense of what his audience wants and what works for them like nobody I've seen in a long time in politics. He also has a talent for smiting his foes that is very rare, literally anyone who crosses his path. Ben Carson rose in the polls for a while — bam, dead. Ted Cruz, he went right for the jugular: "You're a Canadian, Ted." Hillary? Who even thought to bring back Bill Clinton and Monica Lewinsky? Everybody thought that was old news; Bill Clinton is an elder statesman now. "Nope, your husband is a rapist, first woman president, and you've been enabling him." Next! Like many people, I would have thought he would have been out after the first outrageous thing he said, which was probably the John McCain POW comment: "I like people that weren't captured, OK?" Everyone thought, well, that's an ultimate third rail. And the base was like, "F— it, that's what he believes. We like him, he's a winner, he's going to make great deals, he's going to make America great again. It says it right on his hat so obviously that must be true." Carly Fiorina: "You're too ugly to be president." "Hey, wanna see my impression of a guy with cerebral palsy?" What does this guy have to do to get people to turn against him? Fart in Jesus' face or call Reagan a fag?