If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy or yourself, you will succumb in every battle.
We must know ourselves as well as the enemy. If we know the Republicans' candidate, but not our own, we cannot expect to be given any sympathy when we start whining to ourselves, "how did we manage to blow another opportunity?"