In Countdown to Iowa, Trump Is Coasting, as DeSantis and Haley Clash

Negative mailers are overstuffing Iowa mailboxes. Attack ads are cluttering the airwaves. And door knockers are fanning out from Des Moines to Dubuque and everywhere in between.

The Iowa caucuses, the first contest in the Republican nominating calendar, are poised to play an especially consequential role in 2024. But with only 49 days to go, Donald J. Trump’s top rivals are running out of time to catch him as Ron DeSantis and Nikki Haley thrash each other in the final sprint to the starting line.

Far ahead in national polls,...