http://www.cnn.com/2016/10/28/politics/fbi-reviewing-new-emails-in-clinton-probe-director-tells-senate-judiciary-committee/ Director Comey at ~13:30
"Our judgement is that no reasonable prosecutor will bring a case...
In looking back to our investigations,... we cannot find a case that support bringing criminal charges on these facts. All of the cases prosecuted involved some combination of:
(a) clearly intentional and willfull mishandling of classified information, or
(b) vast quantities of information disclosed in such a way to support an inference of intentional misconduct, or
(c)-indications of disloyality to the United States, or
(d) efforts to obstruct justice."
With respect to reopening investigation:
My vote is on d.