On Monday, Iowa holds the first contest in the Republican presidential nominating process and nobody will have more on the line than Ron DeSantis. The Florida governor staked his candidacy on a victory in Iowa, a victory that now seems increasingly remote.Shane Goldmacher, a national political reporter for The Times, and the Daily producers Rob Szypko and Carlos Prieto explain what Mr. DeSantis’s challenge has looked like on the ground in Iowa.Guest: Shane Goldmacher, a national political correspondent for The New York Times.Background reading: 

• A weak night for Donald Trump? A Ron DeSantis flop? Gaming out Iowa.
• From December: Mr. Trump was gaining in Iowa polling, and Mr. DeSantis was holding off Nikki Haley for a distant second.

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