When Georgia Republican Rep. Mike Collins announced his candidacy for Senate last year, his official “war room” account on X posted a short campaign video that ended with the on-screen slogan: “Georiga, Let’s Ride.” From that widely mocked spelling mistake on day one to a House ethics probe to revelations that his son-in-law made white nationalist posts on social media, Collins has suffered a series of setbacks that have hobbled his campaign. Meanwhile, incumbent Democratic Sen. Jon Ossoff has developed a national profile by blasting President Trump and surged in state polls. The latest polls show Ossoff, 39 years old,...