Sun Tzu said:
If your enemy is secure at all points, be prepared for him. If he is in superior strength, evade him. If your opponent is temperamental, seek to irritate him. Pretend to be weak, that he may grow arrogant. If he is taking his ease, give him no rest.-PJ
Most of the liberals I've encountered, in and out of the political arena, were both temperamental and arrogant. It must be in their genes.