Says you.
Clinton took an oath to preserve, protect, and defend the Constitution and was proved to have obstructed justice and perjured himself in an attempt to deny Paula Jones due process. If it had been you whose case had been obstructed by a sitting President, would it be your opinion that the Congress had no legal obligation to remove that President?
It's a fact. In an impeachment the Senate is not a court interpreting a law and bound to follow. Impeachment is a political act. The Senate is free to use their judgement. Ultimately, they can refuse to remove a known criminal (which they did), and they can remove a president because they really don't like him.