Though it is often unecessary and used irresponsibly, the filibuster is a necessary evil of the U.S. Constitution. Our government is constructed as a checks and balances system. In order to insure that this checks and balances system operates properly, steps need to be in place to allow an opposing group to prepare a sufficient argument against a motion they do not support. The filibuster is one of these steps.
No, the filibuster is not consistent with the U.S. Constitution, because it gives people a way to block bills that most people want passed. The Constitution establishes a legislature that allows the elected officials to vote on the things that they want. Having a filibuster only makes it so that they cannot pass bills that the majority want to pass.