Spirited and in-depth conversation with former military and intelligence community member, Sean. Sean's main concern about Bernie Sanders is how his statement of "sick and tired hearing about your damn emails" is not an expression of how the people want to talk more about the issues affecting their day-to-day lives, but rather a dismissal of the act itself--that Bernie Sanders believes that Hillary Clinton's actions in this matter are not severe enough to warrant scrutiny.
Obviously this is serious enough to warrant scrutiny. Obviously they have great implications for national security, and could potentially/perhaps have already jeopardized peoples lives. But what Bernie Sanders is saying, of course, is that the issues that should be focused on in his campaign are those that impact people on a day-to-day basis. Such as campaign-finance, education, stagnant wages, unjust criminal justice, and medical care.
If Sean could be convinced that Bernie Sanders does in fact believe that the email issue is an important one--a critical one--despite not directly talking about it, then it would be much easier for him to consider Bernie Sanders as someone he might vote for. He says that the only way he could be convinced is to hear Bernie Sanders himself say how serious and issue this is.