Even the leftwing folks at The Guardian see trouble ahead for Hillary Clinton because of Emailgate:
It leaves Clinton vulnerable to at least three lines of criticism: that she potentially broke fundamental rules governing the handling and security of state secrets; that she skirted around guidelines put in place to ensure historical accountability and transparency within high public office; and the political attack that she must have had something to hide.
Potentially breaching rules relating to state secrets
Perhaps the most serious accusation facing Clinton is that she may have breached one of the fundamental tenets of classified information. J William Leonard, former director of the body that keeps watch over executive branch secrets, the Information Security Oversight Office, told the Guardian that if Clinton had dealt with confidential government matters through her personal email, that would have been problematic. “There is no such thing as personal copies of classified information. All classified information belongs to the US government and it should never leave the control of the government.”
Tell that to Sandy Berger’s pants.