Pelosi is out of the succession order in 6 weeks.
obama is an unknown quantity that will eventually be quarantined like a person with a new bum fungus, until he expires.
Biden is a lunatic with deeper roots. The damage his people will do if he gets just a brief moment of total control will add a decade to the decade it is going to take to undo what has been done by the 111th. He has been waiting for his moment in the sun for decades, like a retard locked in the cellar. His malice aforethought is well planned out by time in the dark and significant manipulators awaiting their moment to bring the boy out; unlike the stooge who brought him within reach of attainment, Biden has been managed since the one was in diapers by people who intend do real damage that will last.
I may be wrong... I usually am. We just have to grind this one out.