Another contestant joined the still-emerging field of Democrats vying to succeed U.S. Sen. Dick Durbin Wednesday as five-term northwest suburban U.S. Rep. Raja Krishnamoorthi launched his bid, pitching himself as a “radical common sense progressive” to take on President Donald Trump. “A president, ignoring the Constitution, out for revenge, acting like a dictator, claiming he’s a king, surrounded by billionaire backers and MAGA extremists, threatening our rights, rigging the rules to line their pockets,” the 51-year-old Krishnamoorthi of Schaumburg says in his near 2½-minute video announcement released Wednesday. “Wrecking the economy, they profit and working people pay. It’s insanity. People...