During a campaign rally in Bullhead City, Arizona, on Wednesday, President Trump spoke proudly about America’s accomplishments and future goals—including in space. He vowed to make the United States the first country to send an astronaut to Mars, suggesting perhaps it should be a woman, too. And while Republicans are eager to win back the House and get Democratic Rep. Nancy Pelosi out of the speakership, some apparently would like to see her off Earth altogether. “Make it Nancy Pelosi!” one rally attendee yelled back at the president. “Who said that? That’s pretty good! Stand up please, look at this...