To judge by several early polls, Gov. Ron DeSantis of Florida has a decent shot of beating former President Donald Trump in the race to win the Republican presidential nomination in 2024. Some liberals have pronounced this terrible news — because, they say, a DeSantis presidency would be just as awful as, and perhaps even worse than, a second Trump term. This is wrong. A DeSantis presidency would be bad in many ways, and my fellow liberals should fight with all they have to prevent it. But Mr. DeSantis almost certainly would not be worse than Mr. Trump. Exaggerating the...