http://en.wikipedia.org/wiki/Filibuster
The Senate's rule on filibuster allows senators to speak and stall on a vote indefinitely. If 41/100 Senators, representing just 41% of Americans, want to stall a vote, they can successfully filibuster and effectively end a bill. That means that 59% of Americans are misrepresented.
There are many cases recently when a bill was favored by the majority of Americans (in polls), but was filibustered for some odd reason. That does not seem democratic to me. Wikipedia mentions things like the "nuclear option" that could be used to end the current status of filibustering. I believe the government needs to seriously look into that option.
The point is, if we only need 50% to pass legislation, then why do we need 60% to vote on it?
Let the Senate do work.