Difference

You may ask: What is the difference between voting for candidates after they declared their choice of CE and having a group of representatives who do a survey and choose the CE according to the result?

Substantial.

You may realize the latter system is that used by the United States for presidential election. Although appears to be fair, it is in fact a winner-takes-all policy, and opinion of the important minority is neglected. In other words, a marginal dominance becomes a complete victory in a sector (or, a state in USA). It is therefore possible to have a candidate winning an election but would have lost if it is a general election: They win by the skin of their teeth in many sectors and lose terribly in a few sectors.

Donald Trump is the most recent example.