[Jack Simth]

Originally posted by Andres:
I didn't know how your electoral system works.
Let's see if I get this right.
Electors are proportional to the number of congressmen of each state, who are proportional to the population of each state.

Almost right - Electors from a given state = congressman + senetors from that state. Congressmen are proportional to the population, senators are an arbitrary 2 per state; this is why the smallest states still have three electors.

Originally posted by Andres:

This systems prevent a small state with a high voters ratio to disbalance the election. (Note that in other countries like my own, mandatory vote is suposed to prevent tis disbalance. But that has its own pros and cons.)
Wouldn't it be possible to weight votes in a similar way with a simple mathematical formula without the need of electors in the middle?

Possibly, but then you are trying to replace a portion of United States Constitution with something designed to have exactly the same effect as the replaced portion, just to get rid of a few hundred people. Personally, I suspect that minimizing changes to the Constitution to help increase the respect for the document and its intentions are more important than the money wasted on salaries for those few hundred middlemen.