worthless as an election promise
In view of politicians making promises before an election but invariably breaking them after an election.
Therefore the lowest possible denominator of the value of something can be described in this way.
Therefore the lowest possible denominator of the value of something can be described in this way.
'Jack's commitment to give up smoking is as worthless as an election promise.'
'Yeah, he won't last a day.'
'Yeah, he won't last a day.'