HARRISBURG, Pennsylvania — Some people are different in person than they are online. Not Scott Presler. He is as kind, soft-spoken and charismatic in person as he is when he posts about his mission to register voters as Republicans in Pennsylvania. This is true whether he is here at the Farm Show Complex or any of the scores of other events I have run into him attending in the past several years.

Earlier this month, Mr. Presler talked to the hunting community at the National Rifle Association’s annual Great American Outdoor Show, the largest outdoor show in the country. The event attracted thousands of people from across the country to peruse more than 1,000 exhibits, including the newest guns and gear from firearm manufacturers, RVs, and fishing boats; it also afforded them time to visit with each other at the food court located inside 650,000 square feet of exhibit hall space.