The people of the United States are the rightful masters of both Congress and the courts, not to overthrow the Constitution, but to overthrow the men who pervert the Constitution.
Since this is the exact opposite of both the content and spirit of the fake quote - indeed the entire speech Lincoln gave on the floor of the House is diametrically opposed to the fabrication - it is little wonder it is true. Right-wingers live in opposite world, so it is safe to accept the premise that anything they say is the opposite of reality. (With apologies to my turtle-loving friends to the north who, living in Wisconsin, do not live in opposite world, just in a really cold, cheese-loving land)