The time to be making them start chasing is at the beginning of their term, not at the end, and there need to be enough people doing it to make a difference to the outcome for it to matter. A few people trying to change the direction of the main political parties is like someone in a kayak trying to redirect an oil tanker. First you need to change the captain's mind, or in this case the electorate's mind. Then you have the numbers to make it infeasible for politicians to ignore you.