NEW You can now listen to Fox News articles! Acting Attorney General Todd Blanche revealed Sunday that the alleged gunman accused in Saturday's White House Correspondents' Dinner shooting in Washington, D.C., appears to have traveled from Los Angeles through Chicago to the nation's capital by train. "What we have learned and what they’ve learned just overnight is that it appears he traveled from Los Angeles through Chicago to Washington, D.C., and it appears he traveled by train during both legs of that trip," Blanche told Fox News's Shannon Bream on "Fox News Sunday." "The investigation is rapidly developing," he added. Authorities executed multiple search warrants overnight in Los Angeles and Washington, including at a hotel room where the suspect was staying, according to Blanche. Investigators are also reviewing devices and communications recovered during the searches.…