Current and former candidates who use/have used private email systems.
Wisconsin Gov. Scott Walker, once used a private email system as executive of Milwaukee County.
Former Florida Gov. Jeb Bush and former Texas Gov. Rick Perry, both Republicans, also criticized Clinton, even though they each used private emails when they held the post as their state's top executive.
Bobby Jindal, the Republican governor, who campaigned on a platform of providing more transparency in government, uses a private email account to communicate with immediate staff.
Chris Christie, the current Republican governor, follows an executive order, issued by a Democratic predecessor, that emphasizes the privilege for the chief executive: "All portions of records, including electronic communications, that contain advisory, consultative or deliberative information or other records (are) protected by a recognized privilege."
Martin O'Malley, the Democratic former governor of Maryland, used private emails and his personal cellphone to conduct state business