WASHINGTON (AP) -- The No. 2 Senate Democrat accused Republicans on Wednesday of refusing to accept the finality of health care changes, a day after President Barack Obama signed the most sweeping medical system remake since Medicare. "This is a political exercise for too many on the other side of the aisle," said Sen. Dick Durbin. "We're going to tell our people back home, 'It's time to govern. It's time to lead.' "