Have at the one who's already been investigated
Let's be clear about some things that should not be in dispute.
1. James Comey announced that, based on the information the FBI had been able to review at that time, he recommended against the laying of charges in connection with Clinton's operation of a private server. That is not the same as a trial (you can't be tried twice for the same crime). Another FBI Director could recommend charges to the DOJ based on the very same evidence, if it were done reasonably proximately (i.e. shortly after the election).
2. New evidence has now emerged via WikiLeaks that President Obama exchanged e-mails with Clinton on her private server. These e-mails were not provided to the FBI. New evidence, such as this, could justify the reopening of this investigation by Comey (or any subsequent FBI Director). This information could cause the FBI to question Obama regarding the matter, as well as review his e-mail records.
3. The FBI did not investigate contempt of Congress as manifested by Clinton lying under oath to Congress in the Benghazi hearing, or as manifested by improper destruction and withholding of evidence subject to subpoena and a preservation order. That matter has now been referred to the FBI, and
is a pending investigation. We only know this to be a pending investigation because we know Congress referred the matter.
4. The FBI will neither confirm or deny whether there is a pending investigation into the operation of the Clinton Foundation and its connection to Clinton's actions as Secretary of State. It is FBI policy to neither confirm or deny the existence of pending investigations. As a result, we do not know if they are still looking into this. Plenty of new evidence has emerged concerning this matter via WikiLeaks.
So, the real status of Clinton e-mail investigations is:
a. The investigation into her use of a private server is currently closed, but could be reopened based on fresh evidence, or simply based on a different opinion of a new FBI Director.
b. The investigation into her contempt of Congress in relation to the server is
pending.
c. An investigation into the relationship between the Foundation, the server, and her role as SOS is unconfirmed, as it should be. A great deal of new evidence has emerged via WikiLeaks that would relate to such an investigation.