Originally Posted by: Porforis 
The entire purpose of the senate is to protect the rights of smaller states, and is countered by the house and the presidency (elected by more or less popular vote).
Excellent point, although I would like to point out that the original vision for the Senate was that it would specifically represent the
interests of the states. Therefore, senators were supposed to be elected by the state legislatures themselves, not by popular vote. It was only the House of Representatives that was supposed to represent the interests of the people directly, which is why representatives are apportioned by population. This was changed, of course, by the 17th Amendment, which was the brainchild of a (in my opinion) misguided populist movement aimed at making the United States more democratic and less republican.
Modern complaints directed against the Electoral College are equally fallacious, since they ignore the fact that the Electoral College was founded not only to facilitate election of the President in an era when communication was much slower than it is now, but also as a self-consciously republican check on popular whims. While Electors have traditionally cast their ballots according to the popular vote, they are bound only by their own consciences. The Founding Fathers took great pains to ensure that the transfer of power would be orderly and peaceful, to ensure the rule of law under a republican system. They feared democracy just as much, if not more so, than monarchy. As Thomas Jefferson wrote: “
A democracy is nothing more than mob rule, where fifty-one percent of the people may take away the rights of the other forty-nine.”
Originally Posted by: Porforis 
Put quite simply, government doesn't work well on a massive scale, but different forms of government work better on larger scales than others.
I couldn't have said it better myself. In fact, there are
no instances anywhere in history of pure democracies working on anything more than a (very) local scale: we are talking cities -- at most, city-states -- here. Even in the city-states, most of the governance was handled by the local councils. The only pure democracies in existence today of which I am aware are in small New England villages, where the entire village population get together to vote on all local issues. It doesn't take much imagination to realize that such a form of government is extremely inefficient. Delegation of authority to a group of representatives is necessary to get anything done, which is all major governments throughout history have concentrated power in the hands of the few, whether in the form of monarchies, oligarchies, or republics.
Originally Posted by: Porforis 
A pure democracy never would have lasted this long, the country would have fragmented, plain and simple.
Many of the Founding Fathers (Jefferson among them) probably would not have objected too strenuously to such fragmentation. They envisioned the United States as a more or less loose confederation (whence the word
federal) of sovereign states; that is, nations. However, as the disaster of the Articles of Confederation proved, it was not exactly a viable form of government, which is why the current Constitution was drafted to centralize more power in the federal government. Even so, it remained common practice to refer to this nation as "these united States" until after the Civil War, when the Union victory cemented the nation permanently into "the United States." I still believe this was a grave mistake on the part of Abraham Lincoln, by the way, and that states should be free to join or leave the Union at will.