Lets assume I somehow quantify the effect on quality of life of an event with a unit known as quality of life units (QLU's)
Now assume that Δr is the change in my quality of life if Romney is elected
And Δo is the change in my quality of life is Obama is elected
Let p = the probablity that the election is decided by my vote.
[Δo - Δr]*p < (ΔQLU of going out in the rain)
Long story short i'm staying home and watching the second season of south park tomorrow.