Do elected officials defend the Constitution?

When he spoke of his presidential oath in his public letter to Albert G. Hodges, Abraham Lincoln said: "It was in the oath I took that I would, to the best of my ability, preserve, protect, and defend the Constitution of the United States. I could not take the office without taking the oath. Nor was it my view that I might take an oath to get power, and break the oath in using that power."  Do our current Federal elected officials “preserve, protect, and defend the Constitution” or do they “take an oath to get power, and break the oath in using that power?"