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.