I think Obama is in the clear now, though.
If suddenly it was publicized by the Clintons that he was born in Kenya, etc etc, he’d just laugh at them and point at the fabulous job he’s done as POTUS. It’s not like Republicans would do anything before Jan 2017.
Then he can unleash the FBI on Hillary and extort a $100,000,000 bribe from the Clinton Global Initiative in exchange for a POTUS pardon.
A foundation that will survive Bill and Hillary well past the point where even the most hardy hushees die a natural death is the perfect mechanism for ensuring a relatively untarnished legacy. If you were in the Clintons' position with that long trail of baggage and were no longer in power to control those from your past or give them taxpayer-funded government nothing jobs, could you think of a better strategy for legacy control?