It is unusual to have a presidential candidate who faces pretty much equal odds of winning the presidency and getting indicted for corruption and violating national security.
Law enforcement officials have said that Mrs. Clinton, who is seeking the 2016 Democratic nomination for president, is not a target of the investigation, and she has said there is no evidence that her account was hacked. There has also been no evidence that she broke the law, and many specialists believe the occasional appearance of classified information in her account was probably of marginal consequence.