"But I think it's a little late to stop him," Matthews told viewers.
Then the MSNBC star turned to the history books for an analogy to describe his feelings at watching a series of top Democrats be outpaced by Sanders.
"I was reading last night about the fall of France in the summer of 1940," said Matthews, "And the general, Reynaud, calls up Churchill and says, 'It's over.' And Churchill says, 'How can that be? You've got the greatest army in Europe. How can it be over?' He said, 'It's over.'"
"So I had that suppressed feeling," said Matthews.