Candidates for the Republican presidential nomination keep entering the field, despite the fact that Donald Trump polls consistently as the front-runner and Ron DeSantis has emerged as the clear No. 2. Why do so many lesser-tier Republicans think they have a real shot?Shane Goldmacher, a national political correspondent for The Times, offers a guide to the new crop of candidates and discusses their rationale for running.Guest: Shane Goldmacher, a national political correspondent for The New York Times.Background reading: 

• Mike Pence, former vice president — and now rival — to Mr. Trump gave his most aggressive criticism of his former boss, portraying him as unfit to be president.
• Chris Christie’s presidential bid has little chance of success. But if he takes out Mr. Trump along the way, the former New Jersey governor may consider it a victory.

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