So does frequency. The problem with Clinton is that she’s always secretive, gets caught telling lies pretty much constantly, and then resorts to lawyering an issue to death when caught.
In the case of her private email account, which apparently is done by nearly everyone important in the government according to recent reporting, if you use a private email account for official business it becomes a public email account subject to FOIA law. She evaded FOIA by wiping the server. That just doesn’t look good no matter how you spin it.
Now it could very well be that other issues will loom larger. If Clinton enjoys a massive competence and likeability advantage over the GOP candidate, she’ll win. Personally, I think the odds of her enjoying an advantage on ANY quality other than ideological(for Democrats) is unlikely. THe GOP candidate will likely be younger, more honest, more likeable, more straight-talking, more transparent, and have a record of competence and honorable service. So all that will be left for Clinton is “I’m right on the issues!” It won’t be enough. See: John Kerry, Al Gore.