Why would a politician respond to a constituency he has no chance of losing, with anything more than a little lip service?
If there's no cost for a broken promise or a bad policy, what leverage is left?
If one voter is in the bag, the politician is free to make promises to the next one.
You and I did not use the leverage thing in '92 and we were correct. Unfortunately, enough voters took the leverage thing seriously....and screwed us all for at least a generation. This country can take only so much leveraging.