Politician Saying One Thing Doing Another

You know, when you vote for a politician, you should be able to know ahead of time EXACTLY what they are going to do after getting elected.  They should say what they mean right up front, and let the people choose the policy they want.  Instead, politicians – and this has happened on both sides of the aisle – insist on saying whatever they want ti say in order to get elected.  Here is an example of that.  Just irritating, imo.