Here's why changing control of Congress won't matter: George Bush simply ignores laws passed by Congress, claiming executive privilege. Over one in ten laws are ignored via the issuance of "signing statements", whereby the president's office decides how the laws will be interpreted, or which sections of the bills will be ignored.
The Boston Globe has the details of how George Bush "has quietly claimed the authority to disobey more than 750 laws enacted since he took office, asserting that he has the power to set aside any statute passed by Congress when it conflicts with his interpretation of the Constitution."
So, unless the congress is replaced by people like John Conyers, Barbara Boxer, and Russ Feingold, we can kiss our constitution goodbye:
A president who ignores the court, backed by a Congress that is unwilling to challenge him, Golove said, can make the Constitution simply ''disappear."