The Filibuster is a technique in the U.S. Senate where any Senator can speak at length on an act of the body in order to stall or kill the measure. This is a long standing practice in the Senate. It is this measure that makes the senate the more credible and powerful bodies of Congress. This is where even the voice of the minority can be heard. A very important American value.
This is what Hilary Clinton has to say about Republican efforts, led by Senate Majority Leader Bill Frist, attempt to eliminate the Filibuster. This attempt has been deemed the "Nuclear Option" because it will cause an explosion of relations between Senate Republicans & Democrats.
"If invoked, the nuclear option would be, in my view, one of the most egregious abuses of power that the Senate has experienced in its history. ...[T]he majority seeks to turn the United States Senate into a rubber stamp for President Bush's extreme judicial nominees and force all Senators to abdicate our constitutional responsibility of advice and consent. As one sworn to uphold the Constitution, that is something that I cannot do and will not do and that is why I will continue to do all I can to fight for our democratic principles. ...President Bush has nominated a few people to serve on our federal courts for life that I and many of my colleagues believe would not abide by the rule of law, which is why some of these nominees were not confirmed. Now, to stack the courts with these nominees and other extreme judges, the majority is attempting to violate long-established and agreed to Senate rules in order to do away with a constitutional check on the power of the President to pick any judicial nominees he pleases. This is wrong and inconsistent with American values. ...I will do all that I can to ensure that this does not happen. "