Sen. Bill Cassidy doesn’t think about Jan. 6, 2021, the day supporters of President Donald Trump stormed the U.S. Capitol. The Louisiana Republican says he doesn’t “sit around constantly mulling over the past like Lady Macbeth.” Or rewatch the selfie video from inside the Capitol, where he called on the “ hooligans ” to “Stop, period” and allow the peaceful transfer of power. And he certainly doesn’t sit around thinking about the impeachment vote he cast a little over a month later, in which he, along with six other Republicans and all Democrats, found President Trump guilty of “incitement of insurrection.” (The Senate ultimately did not convict Mr. Trump.) “You make a decision based on facts, and you move on,” says Senator Cassidy, as he works a room full of blazer- and kitten-heel-wearing supporters at a seafood restaurant outside New Orleans. He shakes hands, cracks dad jokes, and talks about the things he says actually do keep him up at night, such as flood management and healthcare reform.…