JAN WOLFE and MARK HOSENBALL NEWLY released materials show the FBI failed to fully investigate sexual misconduct allegations against U.S. Supreme Court Justice Brett Kavanaugh when he was nominated to the court in 2018, according to seven Democratic senators. The senators, including Sheldon Whitehouse and Chris Coons, said a letter they received from the FBI last month shows the agency gathered over 4,500 tips relating to Kavanaugh without any apparent further action by investigators. "If the FBI was not authorized to or did not follow up on any of the tips that it received from the tip line, it is…