 The former U.S. attorney who investigated that case sees a parallel between what happened over the weekend and what Colorado has learned in the wake of so many mass shootings. This is not an investigation that will take days. This is going to take months, weeks, months to try to really understand it. When you have something that might be a plot, that might be a threat to a presidential candidate or to a president, you have to make sure that you leave no stone unturned.