(2) The second error is to elect a leader who represents the voter's values but fails to carry out the policies competently. That is called execution risk. (former PM Abdullah Badawi is a good example of a leader with good intentions but poor execution skills).
(3) The third error is to have voted someone who represents what we believe in, who carries out the policies effectively and, in due course, destroys the country because what we believe in is actually bad for the country. This is called voter incompetency risk. (e.g. compliant citizens of the Eurozone were sold the ambitious Euro project ten years ago by European leaders only to reap the fruits of economic despair today.)
(And in the case of Europe, there is increasing evidence that the powerbrokers behind the Eurozone are not aiming for a united peaceful Europe but a European political superstate that subsumes national sovereignty).
In other words, voters’s expectations can influence their politicians' standard of ethics and leadership especially before and during an election campaign period. If we expect mediocre leadership and half-baked policy solutions, we will get them no matter how capable the politicians are.
Of course, all these concerns and issues could very well be side-stepped if we are distracted by the hyped up "economic gains" of the government's half-baked Economic Transformation Program (which does not remove the source of the decline in our nation's productivity - social distribution policies based on race and a reliance on oil resources to subsidise and bail out failed government projects).