In the question-and-answer stage of the Senate impeachment trial, Alan Dershowitz, the celebrity lawyer on President Trump’s legal team, made an argument that stunned many who heard it. Say that Mr. Trump did extend a quid pro quo to Ukraine, and that he did it to improve his own re-election prospects. Says Mr. Dershowitz: What’s wrong with that?“The Latest” is a new series on the impeachment inquiry, from the team behind “The Daily.” You can find more information about it here.