Here is an interesting observation from blogger Nathan Newman about the U.S. Senate.

"If Senators had voting power proportionate to their state's populations, Democrats would have a significant majority in the Senate. Assuming that each Senator got one vote for every person in their state (as of 2000), the totals would be as follows (remembering each state has two Senators):
Democratic Votes: 301.5 million
Republican Votes: 246.8 million "

But Republicans control the Senate by a 51 to 48 margin (and 1 Independent) because tiny little states like Wyoming, Utah and Idaho with a combined population of slightly more than 4 million can send 2 Republicans each giving them the same voting power as California, Florida and New York whose Democratic senators represent states with a combined population of nearly 70 million people.