He is slightly snared in her Email Scandal. His need of getting Hillary into office has nothing to do with the Email scandal, it has to do with reams and reams of illegalities he has committed while President.
He needs Hillary to keep the Justice department from investigating and prosecuting him, because just as soon as they start pulling on a thread from the lowliest of the Obama administration's flunkies, it is going to unravel a web of corruption going all the way back to Obama.
Obama *NEEDS* Hillary in there to protect him, his allies, his donors, etc. from investigations and prosecutions.
His involvement in the Email scheme is small potatoes. He needs Hillary in there to keep the heat off of him.