http://eire.census.gov/popest/data/s...EST2003-01.php
From the 2000 population cenus we can see that it would only take 9 states to decide an election if it were done by popular vote. This would mean polititions would spend all their time in these 9 states and neglect the states down at the bottem. In fact the states at the way bottom of the population percentage would be comepletly ignored as their total worth in population is less than half a percent of the USA.
Why should people in California say what is right and wrong for people in South Dakota? They are geographically completly different. The needs of people in South Dakota is much different that the needs of people in California. This is why we have multiple levels of government in the US: Federal, State, County, and City.
If the elections were decided by popular vote alone then we would have a major problem with everyone flocking to the urban areas so that they could be heard by polititions. I can pretty much guarentee you that the polititions wouldn't care one bit about corparate farming or other ruraral problems.
This is also the same reason that the UN cannot be a ruling body that works by popular vote. What would the world be like if China decided everything for everyone? Like the US the UN does not work by popular vote unfortunatly at the moment it works by every country has an equal vote which is unfortunate. As you can see it would be bad if South Dakota had the same ammount of say in elections as California.
The founding fathers of the American constitution were very wise. Probably because these people had just fought a revolution from European nations, which had very poor and unfair political structures. These men knew much better than any of us do what it was like to live under the rule of a government that does not treat its people fairly, a government that descriminated against them, and a government that gave them nothing. They based this nation on the principals that they knew were important, the very things that were withheld from them under these other governments. Things like freedom of speech, free press, and a right to a fair trial. These men did their best to make the constitution fair for all people. And they did a damned good job.
Even today the constitution stands with relitivaly few modifications. Because the founding fathers developed a government that serves the people instead of the reverse which was true in most other nations at the time and unfortunatly is still true in many nations today.