If Biden is Obamas life boat somebody needs to count all the holes Biden drilled into the hull lately.
You must be thinking of that old Three Stooges film where Curly tries to fix a leaking boat by drilling more holes to let the water out!
Biden is not Obamas lfeboat, but more of an insurance policy.
I think you misunderstood what Fresh Wind meant by "life insurance policy".
What he/she meant was that no one wants Joe in the driver's seat, and would never remove Obama (via impeachment or the 25th amendment).
Nixon admitted that he kept Agnew on the ticket in 1972 for that very reason. And that's why Agnew had to be removed first before impeaching Nixon.
I've always thought that the "canary in the coal mine" for Obama is Biden -- i.e. any serious effort to remove him from office would start with Biden.