I was just starting a response to Kaslin which began, "it won't be long before somebody shows up claiming that you can't impeach a private citizen", and here you are!
Of course you can impeach a private citizen. Impeachment by Parliament was started to REMOVE ministers of the King who carried out policies that Parliament did not want, AND to designate individuals whom Parliament did not wish to allow the King to appoint. Parliament did not then, and does not now, have the authority to advise and consent to appointments, so impeachment provided a mechanism to achieve a similar result.
There are TWO punishments which the Senate can impose on an impeached and convicted person - the first, removal from office, does not apply to Obama. But the second, "disqualification to hold and enjoy any office of honor, trust or profit under the United States" is a FUTURE sanction which could be applied against anyone (Hillary Clinton, for example) who might seek office at a later time.
In the case of Obama, that would block President Kamala Harris from making him an ambassador, or appointing him to the Supreme Court.
“n the case of Obama, that would block President Kamala Harris from making him an ambassador, or appointing him to the Supreme Court.”
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It means that if Hillary is impeached as Sect’y of State for her work in Benghazi, she can’t sit on the board of her Clinton Foundation ever again.