By Jarrett Renshaw and Nandita Bose WASHINGTON (Reuters) -Joe Biden will for the first time as U.S. president hold a political rally in a state where he lost in 2020, when he treks to Florida on Tuesday to stage a showdown with potential 2024 rival, fierce critic and possible Trump successor Ron DeSantis. Biden is expected to offer his most sharply targeted attack yet on DeSantis, a pugnacious governor who has used the power of his office to rise to national prominence by shunning COVID-19 lockdowns, mocking Biden’s age and abilities, penalizing Disney World for opposing a new state law limiti…