DeSantis has made a concerted effort to keep in touch with the people who supported his presidential campaign, including donors and leaders in the early nominating states. Those close to him say he is actively considering how best to maintain his national profile and influence, including potential endorsements in congressional races. His recent moves appear distinctly aimed at keeping intact his political operation and his popularity with Republicans. DeSantis, though, is intent on remaining a relevant figure in the GOP regardless of what happens to Trump. He has tested new strategies for growing his following, including posting self-recorded videos online...