" Rusty turned to him. “Are you familiar with the horseshoe theory of politics?” “What about it?” “Most people think, politically speaking, that the right and the left are on a linear continuum—meaning that the right is on one side of the line, and the left is obviously on the other. That they are polar opposites. Far apart from one another. But the horseshoe theory says that the line is, well, shaped more like a horseshoe—that once you start going to the far right and the far left, that the line curves inward so that the two extremes are far closer to one another than they are to the center. Some go as far as to say it’s more like a circle—that the line bends so much that far left and far right are virtually indistinguishable—tyranny in one form or another.” “Senator?” “Yes? "

― Harlan Coben , The Boy from the Woods (Wilde, #1)