I think Obama is in office because:
He’s black.
The housing crash just before the election.
A perfect storm.
The latter I blame mostly on dem legislation and their shenanigans with Freddie and Fanny.
Bush wasn’t running for re-election so I don’t think he, personally, is ‘precisely why Obama is in office.
“The housing crash just before the election.”
The buildup and the event happened on his watch. The buck stops with him. He failed in his duty and we are suffering the consequences.