And the name of that clue is: The voters weren't just tired of the faces in Congress and voted Republican out of boredom. The voters were Sick and Tired of the Policies of the Dems in Congress and the Whitehouse, and this election was indeed a Mandate for the undoing of "Hope & Change".
Does anyone remember a fire and brimstone campaign from the Republicans leading up to this election? No. The RNC pretty much sat on its hands, and the Senate changed hands. That's the level of outrage and disgust this midterm brought out into the open.